The following is a list of current Catholic religious institutes. Most are Roman Catholic, however Eastern Catholic institutes are included.
The list given here includes not only examples of pontifical-right institutes but also some that are only of diocesan right. It includes even some associations formed with a view to becoming religious institutes but not yet canonically erected even on the diocesan level.
The list does not distinguish between institutes that historically would be classified either as "orders" or as "congregations".
| Name | Post nominals | Founder | Family | Year founded |
|---|
| Camaldolese | E.C. | St. Romuald | Benedictine | 1025 |
| Camaldolese Congregation of the Order of St. Benedict | O.S.B. Cam. | Benedictine |
| Camaldolese Hermits of the Congregation of Monte Corona | Er. Cam. | Fr. Paul Giustiniani | Benedictine | 1525 |
| Canonesses of St. Augustine of the Mercy of Jesus | O.S.A. | Augustinian | 13th century |
| Canons Regular of the Hospitalary Congregation of Great St. Bernard | Augustinian | 11th century |
| Canons Regular of the Lateran | C.R.L. | St. Martin of Tours | Augustinian | 4th century |
| Canons Regular of the New Jerusalem | C.R.N.J. | Bishop Raymond Leo Burke Dom Daniel Augustine Oppenheimer | Augustinian | 2002 |
| Canons Regular of St. John Cantius | S.J.C. | Fr. C. Frank Phillips, C.R. | Augustinian | 1998 |
| Canons Regular of the Swiss Congregation of Saint-Maurice of Agaune | Holy Roman Emperor Sigismund | Augustinian | 515 |
| Clerics Regular Minor (Adorno Fathers) | C.R.M. | St. Francis Caracciolo | Augustinian | 1558 |
| Clerics Regular of St. Paul | C.R.S.P. | St. Anthony Maria Zaccaria | Barnabite | 1530 |
| Camillian Fathers (Clerics Regular, Ministers to the Sick) | M.I./ O.S. Cam. | St. Camillus de Lellis | Camillian | 1582 |
| Canonesses of the Holy Sepulchre | C.R.S.S. |
| Canonesses Regular of St. Augustine | C.R.O.S.A. | Augustinian |
| Canons of Jesus the Lord (Russia) | C.J.D. |
| Canons Regular of the Immaculate Conception | C.R.I.C. | Adrien Gréa | Augustinian | 1871 |
| Canons Regular of St. Victor | Augustinian | 1968 |
| Canossian Fathers (Canossian Sons of Charity) | F.d.C.C. | St. Magdalene of Canossa, Fr. Francesco Luzzi | Canossian | 1831 |
| Canossian Sisters (Canossian Daughters of Charity, Servants of the Poor) | F.D.D.C. | St. Magdalene of Canossa | Canossian | 1808 |
| Capuchin Poor Clares | O.S.C. Cap./ P.C. Cap. | Ven. Maria Laurentia Longo | Franciscan | 1538 |
| Capuchin Sisters of Nazareth | C.N. | Franciscan |
| Carmelites (Order of the Brothers of the Blessed Virgin Mary of Mount Carmel) | O. Carm. | St. Berthold of Calabria | Carmelite | 12th century |
| Carmelite Daughters of the Divine Heart of Jesus | D.J.C. | Mother Anna Maria Tauscher | Carmelite | 1891 |
| Carmelite Sisters of the Sacred Hearts | Carmelite | 1987 |
| Carmelites of Mary Immaculate | C.M.I. | Frs. Palackal Thoma, Porukara Thoma Kathanar, & Kuriakose Elias Chavara | Carmelite | 1831 |
| Carmelites of St. Elijah | C.S.E. | Carmelite | 1986 |
| Carmelite Sisters of Charity | C.C.V. or C. a Ch. | Joaquina Vedruna de Mas | Carmelite | 1826 |
| Carmelite Sisters for the Aged and Infirm | O. Carm. | Mother Mary Angeline Teresa McCrory | Carmelite | 1929 |
| Carmelite Sisters of the Most Sacred Heart of Los Angeles | Ven. Maria Luisa Josefa | Carmelite | 1904 |
| Carthusian Order (Order of St. Bruno) | O. Cart. | St. Bruno of Cologne | Carthusian | 1084 |
| Casamari Cistercian Congregation | Benedictine | 1929 |
| Castilian Cistercian Congregation | Benedictine | 1425 |
| Christian Doctrine Fathers (Doctrinaries) | D.C. | Blessed Fr. César de Bus | 1592 |
| CICM Missionaries (ngregation of the Immaculate Heart of Mary) | C.I.C.M. | Fr. Theophiel Verbist | 1862 |
| Cistercian Congregation of the Crown of Aragon | Benedictine | 1616 |
| Cistercian Congregation of the Holy Family | Benedictine | 1964 |
| Cistercian Congregation of the Immaculate Conception | Benedictine | 1867 |
| Cistercian Congregation of the Immaculate Heart of Mary | Benedictine | 1923 |
| Cistercian Congregation of Mary Mediatrix | Benedictine | 1846 |
| Cistercian Congregation of Mary, Queen of the World | Benedictine | 1953 |
| Cistercian Congregation of St. Bernard in Italy | Benedictine | 1497 |
| Cistercian Order | O.Cist. | St. Robert of Molesme | Benedictine | 1098 |
| Cistercian Order of the Holy Cross | O.C.C.O. | Benedictine |
| Claretians (Congregation of Missionaries, Sons of the Immaculate Heart of the Blessed Virgin Mary) | C.M.F. | St. Anthony Mary Claret | Claretian | 1849 |
| Claretian Sisters (Religious of Mary Immaculate Claretian Missionary Sisters) | C.S. | St. Anthony Mary Claret | Claretian | 1855 |
| Clarist Franciscan Missionaries of the Most Blessed Sacrament (India) | C.F.M.S.S. | Franciscan |
| Colettine Poor Clares | P.C.C. | St. Colette of Corbie | Franciscan | 1211 |
| Columbans (Missionary Society of St. Columban) | S.S.C.M.E. / S.S.C. | 1916 |
| Comboni Missionaries | M.C.C.I. | St. Daniel Comboni | 1867 |
| Community of Betania | Maria Esperanza | 1979 |
| Community of Jesus | Cay Andersen and Judy Sorensen | Foucauldian | 1968 |
| Community of St. John | CSJ | Fr. Marie-Dominique Philippe | 1975 |
| Companions of the Cross | C.C. | Fr. Robert Beddard | 1988 |
| Company of Mary Our Lady | O.D.N. | St. Jeanne de Lestonnac | 1607 |
| Congregation of the Annunciation | B.M.V. | Abbot Columba Marmion | Benedictine | 1920 |
| Congregation of the Blessed Sacrament | S.S.S. | St. Peter Julian Eymard | Eymardian | 1659 |
| Congregation of Christian Brothers (Irish Christian Brothers) | C.F.C. | Blessed Edmund Ignatius Rice | Blessed Edmund Rice | 1802 |
| Congregation of Christian Retreat | Fr. Antoine-Sylvestre Receveur | 1789 |
| Congregation of Christian Workers of St. Joseph Calasanz | C.Op. | 1889 |
| Congregation of Clerics Regular (Theatines) | C.R. | St. Cajetan | 1524 |
| Congregation of the Disciples of the Lord | C.D.D. | Bishop Celso Costantini | 1931 |
| Congregation of Divine Providence (Sisters of Divine Providence) | C.D.P. | Blessed Jean-Martin Moye | Divine Providence | 1827 |
| Congregation of Divine Providence (Germany) | Bishop Wilhelm Emmanuel von Ketteler | 1851 |
| Congregation of the Divine Spirit | C.D.S. | Archbishop John Mark Gannon | 1956 |
| Congregation of Holy Cross (Holy Cross Fathers) | C.S.C. | Blessed Basil Moreau | Holy Cross | 1837 |
| Congregation of Holy Family, India | C.H.F. | Blessed Mariam Thresia | 1914 |
| Congregation of the Holy Spirit Under the Protection of the Immaculate Heart of Mary (Holy Ghost Fathers, Spiritans) | C.S.Sp. | Fr. Claude Poullart des Places | 1703 |
| Congregation of Jesus and Mary (Eudists) | C.I.M. / C.J.M. | Fr. John Eudes | 1643 |
| Congregation of Maronite Lebanese Missionaries | M.L. | 1865 |
| Congregation of the Missionary Sisters of Saint Charles Borromeo (Scalabrinian Sisters) | C.S. | Blessed Giovanni Battista Scalabrini | 1895 |
| Congregation of the Mother of Carmel | C.M.C. | St. Kuriakose Elias Chavara | Carmelite | 1866 |
| Congregation of the Mother Co-Redemptrix (Vietnam) | C.M.C. | Bishop Dominic Maria Trần Đình Thủ | 1909 |
| Congregation of Notre Dame | C.N.D. | St. Marguerite Bourgeoys | 1653 |
| Congregation of the Oblates to Divine Love | Mother Margherita Diomira Crispi |
| Congregation of Our Lady of Calvary | rr. ançois Leclerc du Tremblay, OFM Cap | Benedictine | 1617 |
| Congregation of Our Lady of Fidelity | N.D.F. | Mother Henriette le Forestier d'Osseville | 1831 |
| Congregation of Our Lady of the Missions | R.N.D.M. | Mother Adèle Euphrasie Barbier | Augustinian | 1861 |
| Congregation of Our Lady of Pity | C.L.P. |
| Congregation of Our Lady of Sion | N.D.S. | Frs. Marie Theodor Ratisbonne & Marie-Alphonse Ratisbonne | Congregation of Our Lady of Sion | 1852 |
| Congregation of the Sacred Hearts of Jesus and Mary | SS.CC. | Fr. Pierre Coudrin | 1800 |
| Congregation of the Sisters of Nazareth ALPHABET | C.S.N. | Victoire Larmenier | 1857 |
| Congregation of the Sisters of Our Lady of Mercy ALPHABET | O.L.M. | Mother Teresa Eva Potocka | 1862 |
| Congregation of the Sisters of the Resurrection ALPHABET | C.R. | Celine Borzecka and Hedwig Borzecka | 1891 |
| Congregation of the Sisters of St. Felix of Cantalice (Felician Sisters) MOVE TO F | C.S.S.F. | Sophia Truszkowska | 1855 |
| Congregation of St. Basil | C.S.B. | Fr. Joseph Lapierre | Basilian | 1822 |
| Congregation of St. John | F.J. |
| Congregation of St. Michael the Archangel | C.S.M.A. |
| Congregation of St. Thérèse of Lisieux | C.S.T. | Metropolitan Mar Augustine Kandathil | 1931 / 1945 |
| Congregation of the Sisters of Mercy | R.S.M. | Sisters of Mercy | 1991 |
| Congregation of the Sisters of Our Lady of Mercy (Divine Mercy Sisters) | O.L.M. | Mother Teresa Eva Potocka | 1862 |
| Congregation of Windesheim | Fr. Geert GrooteFlorens Radewyns | Augustinian | 1386 |
| Cono-Sur Congregation | O.S.B. | Benedictine | 1976 |
| Consolata Missionaries | I.M.C. | Giuseppe Allamano | 1901 |
| Crosiers (Canons Regular of the Order of the Holy Cross) | O.S.C. | Theodorus de Cellis | Late 12th century |
| Crusade of the Holy Spirit | C.H.S. |
| Name | Post nominals | Founder | Family | Year founded |
|---|
| Daughters of Charity of St. Vincent de Paul | D.C. | St. Vincent de Paul and St. Louise de Marillac | Vincentian-Setonian | 1633 |
| Daughters of the Church (India) | D.C./ E.F. |
| Daughters of the Cross of Liege | F.C. |
| Daughters of Divine Charity | F.D.C. | Mother Franziska Lechner | 1868 |
| Daughters of Divine Love | D.D.L. | Bishop Godfrey Mary Paul Okoye | 1969 |
| Daughters of Divine Zeal | F.D.Z. | St. Annibale Maria di Francia | 1887 |
| Daughters of the Heart of Mary | D.H.M. |
| Daughters of the Holy Cross, Sisters of St. Andrew | Andrew Fournet, Joan Elizabeth Bichier des Ages | 1807 |
| Daughters of the Holy Spirit | Ven. Félix de Jesús Rougier | Felixian | 1924 |
| Daughters of the Holy Spirit (White Sisters) | D.H.S. | Srs. Marie Belavenne and Renée Burel | 1706 |
| Daughters of the Immaculate Heart of Mary | D.I.H.M. |
| Daughters of Jesus (France) | Abbot Pierre Noury | 1834 |
| Daughters of Jesus (Spain) | F.I. | St. Saint Candida Maria of Jesus | 1871 |
| Daughters of Mary | D.M. | Msgr. Joseph Kuzhinjalil | 1938 |
| Daughters of Mary of the Immaculate Conception | D.M. | Msgr. Lucian Bojnowski | 1904 |
| Daughters of Mary, Mother of Healing Love | D.M.M.L. | Mother Paul Marie | 2003 |
| Daughters of Mary, Mother of Our Savior | Bishop Clarence Kelly | 1984 |
| Daughters of the Oratory | F.d.O. | Vincenzo Grossi | 1885 |
| Daughters of Our Lady of Compassion | D.O.L.C. | Mother Suzanne Aubert | 1892 |
| Daughters of Our Lady of Mercy | St. Maria Giuseppa Rossello | 1837 |
| Daughters of Our Lady of the Garden | O.L.G. | St. Anthony Gianelli | Gianelli | 1829 |
| Daughters of the Sacred Heart of Jesus | F.S.C.G. | Ignazia Verzeri | 1831 |
| Daughters of St. Ann | D.S.A. |
| Daughters of St. Anne of Calcutta | D.S.A. |
| Daughters of St. Anne of Ranchi | D.S.A. |
| Daughters of St. Camillus | D.S.C. | Camillian |
| Daughters of St. Francis of Assisi | D.S.F.A. | Franciscan | 1894 |
| Daughters of St. Francis de Sales | D.S.F.S. | Salesian |
| Daughters of Saint Mary of Providence | F.S.M.P. | Dina Bosatta, Luigi Guanella | 1872 |
| Daughters of St. Paul (Pauline Sisters) | F.S.P. | Blessed James Alberione and Ven. Mother Thecla Merlo | Pauline | 1915 |
| Daughters of St. Thomas | D.S.T. |
| Daughters of Wisdom | D.W. | St. Louis de Montfort and Blessed Marie Louise Trichet | Montfortian | 1707 |
| De La Salle Brothers | F.S.C. | St. Jean-Baptiste de La Salle | Lasallian | 1680 |
| Deen Bandhu Samaj (India) | D.B.S. |
| Discalced Augustinians | O.A.D. | Augustinian | 1592 |
| Discalced Carmelites (Barefoot Carmelites) | O.C.D. | St. Teresa of Ávila and St. John of the Cross | Carmelite | 1568 |
| Discalced Mercedarians | O.M.D. | Fr. Juan Bautista González Alcázar, O. de M. | Mercedarian | 1603 |
| Disciples of the Lord Jesus Christ |
| Dominicans (Order of Preachers) | O.P. | St. Dominic | Dominican | 13th century |
| Dominican Missionaries for the Deaf Apostolate | O.P. Miss. | Dominican | 2004 |
| Dominican Missionary Sisters of St. Elizabeth | D.M.S.E. | Dominican |
| Dominican Nuns of the Perpetual Rosary | O.P. | Mother Domien-Marie Saintourens | Dominican | 1880 |
| Dominican Sisters of the Annunciation of the Blessed Virgin | O.P. | St. Francisco Coll Guitart | Dominican | 1856 |
| Dominican Sisters of Blauvelt (Congregation of St. Dominic of Blauvelt) | O.P. | Mother Mary Sammon | Dominican | 1890 |
| Dominican Sisters of Hawthorne | O.P. | Mother Rose Hawthorne Lathrop | Dominican | 1900 |
| Dominican Sisters of Hope | O.P. | Dominican | 1995 |
| Dominican Sisters of Grand Rapids (Dominican Congregation of Our Lady of the Sacred Heart) | O.P. | Bishop Caspar Henry Borgess | Dominican | 1877 |
| Dominican Sisters of the Immaculate Conception | O.P. | Mother Maria Bialecka | Dominican | 1861 |
| Dominican Sisters of Mary, Mother of the Eucharist | O.P. | Mother Mary Assumpta Long | Dominican | 1997 |
| Dominican Sisters of the Most Holy Name | O.P. | Dominican | 1850 |
| Dominican Sisters of Peace | O.P. | Dominican | 2009 |
| Dominican Sisters of St. Cecilia | O.P. | Bishop James Whelan | Dominican | 1860 |
| Dominican Sisters of San Rafael (Dominican Congregation of the Most Holy Name of Jesus) | O.P. | Bishop Joseph Sadoc Alemany and Mother Mary of the Cross Goemaere | Dominican | 1850 |
| Dominican Sisters of Sparkill (Dominican Congregation of Our Lady of the Rosary) | O.S.D. | Mother Catherine M. Antoninus | Dominican | 1876 |
| Dominican Sisters of the Queen of the Rosary | O.P. | Dominican | 1888 |
| Name | Post nominals | Founder | Family | Year founded | | Faithful Companions of Jesus Sisters | F.C.J. | Ven. Marie-Madeleine d'Houët | 1820 |
| Fathers of Mercy | C.P.M. | Fr. Jean-Baptiste Rauzan | 1808 |
| Federation of the Sisters of Mercy | R.S.M. | Sisters of Mercy | 1973 |
| Filippini Sisters (Religious Teachers Filippini, Sisters of St. Lucy Filippini) | M.P.F. | St. Lucy Filippini and Cardinal Marco Antonio Barbarigo | 1692 |
| Franciscan Apostolic Sisters | F.A.S. | Fr. Gerardo Filippeto | Franciscan | 1954 |
| Franciscan Brothers of Brooklyn | O.S.F. | Bishop John Loughlin | 1858 |
| Franciscan Brothers of the Eucharist | F.B.E. | 2002 |
| Franciscan Brothers of the Holy Cross | F.F.S.C. | James Wirth | 1862 |
| Franciscan Brothers of Peace | F.B.P. | Br. Michael Gaworski | 1982 |
| Franciscan Clarist Congregation | 19th century |
| Franciscan Friars of the Immaculate | F.I. | Frs. Stefano Maria Manelli and Gabriel Maria Pellettieri | 1970 |
| Franciscan Friars of the Renewal | C.F.R. | Fr. Benedict Groeschel | 1987 |
| Franciscan Handmaids of Mary | Ignatius Lissner | 1915 |
| Franciscan Hospitaller Sisters of the Immaculate Conception | F.H.I.C. | Mother Maria Clara | 1871 |
| Franciscan Minims of the Perpetual Help of Mary | F.M. | 1942 |
| Franciscan Missionaries of Christ the King | F.M.C.K. | Mother Bridget Sequeira | Franciscan | 1937 |
| Franciscan Missionaries of the Divine Motherhood | F.M.D.M. | Mother Colette | Franciscan | 1887 |
| Franciscan Missionaries of the Eternal Word | M.F.V.A. | 1987 |
| Franciscan Missionaries of Mary | F.M.M. | Helene de Chappotin | 1877 |
| Franciscan Missionaries of St. Joseph | F.M.S.J. |
| Franciscan Missionary Sisters for Africa | F.M.S.A. |
| Franciscan Missionary Sisters of the Immaculate Heart of Mary | O.S.F. | Blessed Mary Catherine Troiani | 1868 |
| Franciscan Missionary Sisters of the Infant Jesus | 1879 |
| Franciscan Missionary Sisters of Littlehampton | F.M.S.L. |
| Franciscan Nardini Sisters of the Holy Family (Nardini Sisters, Mallersdorfer Sisters) | F.P.M. | Blessed Paul Joseph Nardini | 1855 |
| Franciscan Servants of Jesus | 1997 |
| Franciscan Servants of the Sacred Heart | S.S.C. |
| Franciscan Sisters of Allegany | O.S.F. | Fr. Pamfilo of Magliano | 1859 |
| Franciscan Sisters of Christ the King | Fr. Eugene N. Heidt | 2000 |
| Franciscan Sisters of Christian Charity | O.S.F. | Ambrose Oschwald | Franciscan | 1869 |
| Franciscan Sisters of the Eucharist | F.S.E. | Franciscan | 1973 |
| Franciscan Sisters of the Eucharistic Heart of Jesus | F.E.H.J. |
| Franciscan Sisters of the Family of Mary | Zygmunt Szczęsny Feliński | 1857 |
| Franciscan Sisters of the Immaculate Conception | F.S.I.C. | Refugio Morales | 1874 |
| Franciscan Sisters of the Immaculate Conception | F.I.C. |
| Franciscan Sisters of Mary | F.S.M. | 1987 |
| Franciscan Sisters of Mary Immaculate | Blessed Mother Caritas Brader | 1893 |
| Franciscan Sisters of Mill Hill | O.S.F. |
| Franciscan Sisters of Penance of the Sorrowful Mother | T.O.R. | Bishop Albert Henry Ottenweller | 1988 |
| Franciscan Sisters of Perpetual Adoration | F.S.P.A. | 1849 |
| Franciscan Sisters of the Sacred Heart | F.S.S.H. | Fr. Wilhelm Berger | 1866 |
| Franciscan Sisters of St. Aloysius Gonzaga | F.S.A.G. | Franciscan |
| Franciscan Sisters of St. Clare | F.S.C. |
| Francisca Sisters of St. Elizabeth | O.S.E. |
| Franciscan Sisters of St. Joseph | F.S.S.J. |
| Franciscan Sisters of St. Mary of the Angels | F.S.M.A. |
| Franciscan Sisters of Siessen | O.S.F. |
| Fransalians (Missionaries of St. Francis de Sales) | M.S.F.S. | Fr. Peter Mermier | De Sales | 1838 |
| Fraternity of Charles de Foucauld | Foucauldian | 1992 |
| Fraternity Jesus Caritas | Foucauldian | 1952 |
| Friars of St. Francis | F.S.F. | Franciscan | 1993 |
| Order of Friars Minor Capuchin | O.F.M. Cap. | Fr. Matteo da Bascio | Franciscan | 1525 |
| Order of Friars Minor Conventual (Grey Friars) | O.F.M. Conv. | St. Francis of Assisi | 1209 |
| Order of St. Clare (Poor Clares) | O.S.C. | St. Francis of Assisi and St. Clare of Assisi | 1212 |
| Poor Clares of Perpetual Adoration | P.C.P.A. | Marie Claire Bouillevaux | 1854 |
| School Sisters of St. Francis | S.S.S.F. | Sr. Mary Alexia | 1874 |
| Sisters of St. Francis of the Martyr St. George | F.S.G.M. | Fr. John Gerard Dall and Mother M. Anselma Bopp | 1869 |
| Sisters of St. Joseph of the Third Order of St. Francis | S.S.J.-T.O.S.F. | 46 School Sisters of St. Francis | 1901 |
| Tertiary Sisters of St. Francis | Mother Maria Heuber | 1700 |
| Name | Post nominals | Founder | Family | Year founded | | Malabar Missionary Brothers (India) | M.M.B. |
| Marian Fathers of the Immaculate Conception of the Blessed Virgin Mary | M.I.C. | St. Stanislaus Papczyński | 1673 |
| Marian Sisters of the Diocese of Lincoln (Marian Sisters) | M.S. | 1952 |
| Marianists (Society of Mary) | S.M. | Marianist |
| Marianist Lay Communities | M.L.C. | Marianist |
| Marianist Sisters | F.M.I. | Blessed William Joseph Chaminade and Ven. Adèle de Batz de Trenquelléon | Marianist | 1816 |
| Marianites of Holy Cross | M.S.C. | Blessed Basil Moreau | Holy Cross | 1841 |
| Marist Brothers | F.M.S. | St. Marcellin Champagnat | Marist | 1817 |
| Marist Sisters | S.M. | Ven. Jean-Claude Colin and Jeanne-Marie Chavoin | Marist | 1823 |
| Marist Fathers (Society of Mary) | S.M. | Ven. Jean-Claude Colin | Marist | 1816 |
| Maryknoll Fathers (Catholic Foreign Mission Society of America) | M.M. | Fr. Thomas Price and Fr. James Walsh | Maryknoll | 1911 |
| Maryknoll Lay Missioners | M.K.L.M. | Maryknoll | 1975 |
| Maryknoll Sisters of St. Dominic | M.M. | Mother Mary Joseph Rogers | Maryknoll | 1912 |
| Medical Missionaries of Mary | M.M.M. | Mary Martin | Benedictine | 1937 |
| Medical Mission Sisters | S.C.M.M. | Dr. Anna Dengel | 1925 |
| Medical Sisters of St. Francis of Assisi (India) | O.S.F. | Franciscan |
| Mehrerau Cistercian Congregation | Benedictine | 1624 |
| Mercedarians (Order of the Blessed Virgin Mary of Mercy) | O. de M./ O. Merc. | St. Peter Nolasco | Mercedarian | 1218 |
| Mercedarian Missionaries of Berríz | Mother Margarita Lopez de Maturana | Mercedarian | 1926 |
| Mercedarian Sisters of the Blessed Sacrament | H.M.S.S. | Mother Maria del Refugio | Mercedarian | 1946 |
| Messengers of Mother Mary | M.M.M. |
| Miles Christi | M.C. | Fr. Roberto Juan Yannuzzi | 1994 |
| Military and Hospitaller Order of St. Lazarus of Jerusalem | O.S.L.J. | Crusaders of the Latin Kingdom of Jerusalem | 1119 |
| Militia Immaculatae (Knights of the Immaculata) | M.I. | St. Maximillian Kolbe | 1917 |
| Mill Hill Missionaries (St. Joseph’s Missionary Society of Mill Hill) | M.H.M. | Fr. Herbert Alfred Vaughan | 1866 |
| Minims (Order of Minims) | O.M. | St. Francis of Paola | Minim | 1435 |
| Minim Nuns (Federation of the Minim Nuns) | Minim |
| Mission Helpers of The Sacred Heart | M.H.S.H. | 1890 |
| Missionaries of Charity | M.C. | St. Mother Teresa of Calcutta | Missionaries of Charity | 1950 |
| Missionaries of Charity Brothers | M.C. | St. Mother Teresa of Calcutta and Fr. Ian Travers-Ball | Missionaries of Charity | 1963 |
| Missionaries of Charity Contemplative Fathers and Brothers | M.C. | St. Mother Teresa of Calcutta and Fr. Sebastian Vazhakala | Missionaries of Charity | 1979 |
| Missionaries of Charity Contemplative Sisters | M.C. | St. Mother Teresa of Calcutta and Sr. M. Nirmala | Missionaries of Charity | 1963 |
| Missionaries of Charity Fathers | M.C. | St. Mother Teresa of Calcutta and Fr. Joseph Langford | Missionaries of Charity | 1984 |
| Missionary Catechists of Divine Providence | M.C.D.P. | Mother Mary Benitia Vermeersch | Divine Providence | 1930 |
| Missionary Congregation for the Blessed Sacrament | M.C.B.S. | Fr. Mathew Alakulam and Fr. Joseph Paredom | 1933 |
| Missionaries of St. Giuseppe of Mexico | M.J. |
| Missionaries of God's Love | M.G.L. | Fr. Ken Barker | 1986 |
| Missionaries of the Gospel of Life | Fr. Frank Pavone | Priests for Life | 2005 |
| Missionaries of the Holy Spirit | M.Sp.S. | Ven. Félix de Jesús Rougier | Felixian | 1914 |
| Missionaries of the Immaculate Heart of Mary | M.I.H.M. |
| Missionaries of Jesus the Eternal Priest | M.J. | Ven. Margherita Maria Guaini | 1947 |
| Missionaries of La Salette | M.S. | Bishop Philibert de Bruillard | La Salette | 1852 |
| Missionaries of the Little Flower | M.L.F. |
| Missionaries of Mariannhill | C.M.M. | Fr. Francis Pfanner | 1907 |
| Missionaries of Mary | Srs. Sophie Renoux, Edit Fabian, and Rachel Luxford | 2007 |
| Missionaries of Mary Immaculate | M.M.I. |
| Missionaries of Mary Mediatrix | M.M.M. |
| Missionary Oblates of Mary Immaculate | O.M.I. | St. Eugène de Mazenod | 1816 |
| Missionaries of the Nativity of Mary | M.N.M. |
| Missionaries of the Poor | M.O.P. | Fr. Richard Ho Lung | 1981 |
| Missionaries of the Precious Blood (Precious Blood Fathers) | C.PP.S. | St. Gaspar del Bufalo | 1815 |
| Missionaries of the Sacred Heart | M.S.C. | Blessed Jules Chevalier | 1854 |
| Missionaries of the Sacred Hearts of Jesus and Mary | M.S.H.J.M. | St. Gaetano Errico | 1836 |
| Missionaries of St. Alphonso de Liguori | St. Anthony Gianelli | Gianelli | 1827 |
| Missionaries of St. Joseph | M.J. |
| Missionary Congregation of Saint Andrew the Apostle | С.M.S.A.A. | Fr. Irineusz Michalik | 1997 |
| Missionary Servants of Most Holy Trinity | S.T. |
| Missionary Sisters of the Immaculate Conception | S.M.I.C. | Abbot Armand August Bahlmann and Mother Elizabeth Tombrock | Franciscan | 1910 |
| Missionary Sisters of St. Theresa, Servant of Passion | S.T.S.P. | Mother G. Teresa, Bishop J. Morgades de vic and Mother Benedicta louisa. | Consolars of Christ Passion Family. | 18 93 -1992 |
| Missionary Sisters of La Salette | S.N.D.S. | Bishop Philibert de Bruillard | La Salette | 1852 |
| S.Sp.S. | St. Arnold Jansen | 1889 |
| Missionary Society of St. Paul of Nigeria | M.S.P. | Catholic Bishops' Conference of Nigeria | 1977 |
| Missionary Society of St. Thomas the Apostle | M.S.T. |
| Missionary Sisters, Servants of the Holy Spirit | S.S.p.S. | St. Arnold Jansen | 1889 |
| Monastic Fraternities of Jerusalem | Br. Pierre-Marie Delfieux | 1975 |
| Monks of Bethlehem (Monastic Brothers of Bethlehem, of the Assumption of the Virgin and of St. Bruno) | Carthusian | 1976 |
| Monks of the Most Blessed Virgin Mary of Mount Carmel | M. Carm. | Bishop David L. Ricken | Carmelite | 2003 |
| Montfort Missionaries (Company of Mary) | S.M.M. | St. Louis de Montfort | Montfortian | 1705 |
| Name | Post nominals | Founder | Family | Year founded |
|---|
| Sadhu Sevana Sisters (India) | S.S.S. | Fr. Thomas Maliekal | 1975 |
| St. Patrick's Missionary Society (St. Patrick's Society for Foreign Missions, Kiltegan Fathers) | S.P.S. | Bishop Joseph Shanahan and Fr. Patrick Whitney | 1920 |
| Salesians of St. Don Bosco (Society of St. Francis de Sales) | S.D.B. | St. Don Bosco | Salesian | 1857 |
| Salesian Sisters (Daughters of Mary Help of Christians) | F.M.A. | St. Maria Domenica Mazzarello | Salesian | 1872 |
| Salvatorians (Society of the Divine Savior) | S.D.S. | Ven. Francis Mary of the Cross Jordan | 1881 |
| Scalabrinian Missionaries (Missionaries of St. Charles Borromeo) | C.S. | Blessed Giovanni Battista Scalabrini | Scalabrinian | 1887 |
| Scalabrinian Missionary Sisters (Missionary Sisters of St. Charles Borromeo) | C.S. | Blessed Giovanni Battista Scalabrini | Scalabrinian | 1895 |
| Scarboro Foreign Mission Society | S.F.M. | 1918 |
| School Sisters of Christ the King | C.K. | Bishop Glennon Patrick Flavin | 1976 |
| School Sisters of Notre Dame | S.S.N.D. | Mother Caroline Gerhardinger | 1833 |
| Servants of Christ | A.K / A.D.S.K | Mgr. Petrus Johannes Willekens. SJ | 1938 |
| Servants of the Blessed Sacrament | St. Peter Julian Eymard and Mother Marguerite Guillot | Eymardian | 1858 |
| Servants of Charity (Guanellians) | Sd.C./ S.C. | St. Luigi Guanella | 1908 |
| Servants of the Holy Cross | Augustinian |
| Servants of the Holy Family | S.S.F. | 1977 |
| Servants of the Holy Heart of Mary | S.S.C.M. |
| Servants of the Lord and the Virgin of Matara | S.S.V.M | Fr. Carlos Miguel Buela | Institute of the Incarnate Word | 1985 |
| Servites (Order of the Servants of Mary) | O.S.M. | Seven Holy Founders | Servites | 1233 |
| Seva Missionary Sisters of Mary | S.M.S.M. | Msgr. John Kottaram | 1974 |
| Servite Sisters (Religious Sisters of the Third Order of Servites, Mantellates) | O.S.M. | St. Philip and St. Juliana Falconieri | Servites | 1284 |
| Sinsinawa Dominican Sisters (Sinsinawa Dominican Congregation of the Most Holy Rosary) | O.P. | Fr. Samuel Charles Mazzuchelli | Dominican | 1847 |
| Sisters Adorers Handmaids of the Blessed Sacrament and of Charity | A.A.S.C. |
| Sister Adorers of the Precious Blood | R.P.G. | Mother Catherine Caouette | 1861 |
| Sisters Adorers of the Precious Blood and Daughters of Mary Immaculate | A.P.B. |
| Sisters Adorers of the Royal Heart of Jesus Christ Sovereign Priest | Cardinal Ennio Antonelli | Salesian | 2004 |
| Sisters of Adoration, Slaves of the Blessed Sacrament and of Charity | Mother Maria Micaela | 1850 |
| Sisters of the Apostolic Carmel | A.C. | Mother Veronica of the Passion | Carmelite | 1870 |
| Sisters of Bethlehem (Monastic Sisters of Bethlehem, of the Assumption of the Virgin and of St. Bruno) | Carthusian | 1950 |
| Sisters of the Blessed Sacrament | St. Katharine Drexel | 1891 |
| Sisters of Calvary | S.C. |
| Sisters of the Cenacle | R.C. | Fr. Jean-Pierre Etienne Terme and Mother Thérèse Couderc | 1826 |
| Sisters of Charity of Australia | R.S.C. | Vincentian-Setonian | 1838 |
| Sisters of Charity of the -Blessed Virgin Mary | B.V.M. | Mother Mary Frances Clarke | Vincentian-Setonian | 1831 |
| Sisters of Charity of Cincinnati | S.C. | Mother Margaret Farrell George | Vincentian-Setonian | 1829 |
| Sisters of Charity of Good and Perpetual Succour | B.P.S. | Mother Caroline Lenferna de Laresle | Vincentian-Setonian | 1850 |
| Sisters of Charity of Halifax (Sisters of Charity of St. Vincent de Paul) | S.C. | Archbishop William Walsh | Vincentian-Setonian | 1849 |
| Sisters of Charity of the Immaculate Conception | S.C.I.C. | Bishop Thomas-Louis Connolly and Mother Honoria Conway | Vincentian-Setonian | 1854 |
| Sisters of Charity of the Incarnate Word of Houston | C.C.V.I. | Bishop Claude Marie Dubuis | Augustinian | 1866 |
| Sisters of Charity of the Incarnate Word of San Antonio | C.C.V.I. | Bishop Claude Marie Dubuis and St. Madeleine Chollet | Augustinian | 1869 |
| Sisters of Charity of Jesus and Mary | Canon Petrus Joseph Triest | Vincentian-Setonian | 1803 |
| Sisters of Charity of Leavenworth | S.C.L. | Mother Xavier Ross | Vincentian-Setonian | 1858 |
| Sisters of Charity of Nazareth | S.C.N. | Bishop John Baptist Mary David | Vincentian-Setonian | 1812 |
| Sisters of Charity of Nevers | Dom Jean-Baptiste Delaveyne | Vincentian-Setonian | 1680 |
| Sisters of Charity of New York | S.C. | 3 Sisters of Charity from Philadelphia | Vincentian-Setonian | 1841 |
| Sisters of Charity of Ottawa (Grey Nuns of Ottawa) | S.C.O. | Mother Elizabeth Bruyere | Vincentian-Setonian | 1845 |
| Sisters of Charity of Our Lady of Evron | Mother Perrine Thulard | Vincentian-Setonian | 1682 |
| Sisters of Charity of Our Lady of Mercy | O.L.M. | Bishop John England | Vincentian-Setonian | 1829 |
| Sisters of Charity of Our Lady Mother of the Church | Vincentian-Setonian |
| Sisters of Charity of Providence | S.P. | Émilie Gamelin | 1844 |
| Sisters of Charity of St. Ann | S.Ch.S.A. | Vincentian-Setonian |
| Sisters of Charity of St. Augustine | S.C.A. | Bishop Louis Amadeus Rappe | Augustinian | 1851 |
| Sisters of Charity of Sts. Bartolomea Capitanio and Vincenza Gerosa | S.C.C.G. | St. Bartolomea Capitanio and St. Vincenza Gerosa | Vincentian-Setonian | 1832 |
| Sisters of Charity of St. Elizabeth | S.C. | Mother Mary Xavier Mehegan | Vincentian-Setonian | 1859 |
| Sisters of Charity of St. Hyacinthe | S.C.S.H. | Archbishop Joseph Signay | Vincentian-Setonian | 1840 |
| Sisters of Charity of St. John of God (India) | S.C.J.G. | Vincentian-Setonian |
| Sisters of Charity of St. Paul | S.P.C. | Fr. Louis Chauvet | 1696 |
| Sisters of Charity of Seton Hill | S.C. | Mother Aloysia Lowe | Vincentian-Setonian | 1870 |
| Sisters of Charity of Quebec | S.C.Q. | Mother Marcelle Mallet | Vincentian-Setonian | 1849 |
| Sisters of Christian Charity | S.C.C. | Blessed Pauline von Mallinckrodt | 1849 |
| Sisters of the Child Jesus of Chauffailles | R.E.J. | Sisters of the Child Jesus | 1859 |
| Sisters of the Child Jesus of Le Puy-en-Velay | R.E.J. | Mother Ann-Marie Martel | Sisters of the Child Jesus | 1676 |
| Sisters of the Cross and Passion | C.P. | Mother Elizabeth Prout | Passionist | 1852 |
| Sisters of the Destitute | Fr. Varghese Payyappilly Palakkappilly | 1927 |
| Sisters of the Divine Compassion | Mother Mary Veronica | 1886 |
| Sisters of the Good Shepherd (Congregation of Our Lady of Charity of the Good Shepherd) | R.G.S. | St. Mary Euphrasia Pelletier | Good Shepherd Sisters | 1835 |
| Sisters of the Good Shepherd of Omaha | R.G.S. | Bishop Richard Scannell | Good Shepherd Sisters | 1894 |
| Sisters of the Guardian Angel | S.A.C. |
| Sisters of the Holy Childhood of Jesus and Mary | Anne-Victoire Méjanes | 1807 |
| Sisters of the Holy Cross (Indiana) | C.S.C. | Holy Cross | 1841 |
| Sisters of Holy Cross (Montreal) | C.S.C. | Holy Cross | 1847 |
| Sisters of the Holy Family (Louisiana) | S.H.F. | Ven. Henriette DeLille | 1837 |
| Sisters of the Holy Family of Nazareth | C.S.F.N. | Franciszka Siedliska | 1875 |
| Sisters of the Holy Family of Villefranche | S.F. | Émilie de Rodat | 1816 |
| Sisters of the Holy Humility of Mary | H.M. | Fr. John Joseph Begel | 1856 |
| Sisters of the Holy Names of Jesus and Mary | S.N.J.M. | Marie Rose Durocher | 1837 |
| Sisters of the Holy Redeemer |
| Sisters of the Holy Spirit and Mary Immaculate | S.H.Sp. | Mother Margaret Mary Healy Murphy | 1887 |
| Sisters of the Holy Union of the Sacred Hearts | S.U.S.C. | John Baptist Debrabant | Salesian | 1828 |
| Sisters of the Immaculate Conception of Castres | St. Émilie de Villeneuve | 19th century |
| Sisters of the Infant Jesus | I.J. | Fr. Nicholas Barré | 1666 |
| Sisters of Jesus Crucified | C.J.C. |
| Sisters of Jesus, Our Hope | S.J.H. | 1992 |
| Sisters of Life | S.V. | Cardinal John Joseph O'Connor | 1991 |
| Sisters of the Little Flower of Bethany (India) | B.S. |
| Sisters of Marie-Auxiliatrice | M.A. | Sophie-Thérèse de Soubiran La Louvière | 1864 |
| Sisters of Mary, Mother of the Church | S.M.M.C. | 7 Founders in the Diocese of Spokane | 2007 |
| Sisters of Mary of the Presentation | S.M.P. | Father Joachim Fleury, Mother St. Louis | Vincentian | 1828 |
| Sisters of Mary Queen | C.M.R. |
| Sisters of Mercy (Religious Sisters of Mercy) | R.S.M. | Mother Catherine McAuley | Sisters of Mercy | 1831 |
| Sisters of Mercy of the Americas | R.S.M. | Sisters of Mercy | 1991 |
| Sisters of Mercy in Australia and Papua New Guinea | R.S.M. | Mother Ursula Frayne | Sisters of Mercy | 1846 |
| Sisters of Mercy of Newfoundland | R.S.M. | Sisters of Mercy |
| Sisters of Mercy of Philippines | R.S.M. | Bishop Lino Gonzaga | Sisters of Mercy | 1954 |
| Sisters of Mercy of St. Borromeo of Alexandria | Borromean Sisters | 1884 |
| Sisters of Mercy of St. Borromeo of Cairo | Borromean Sisters | 1904 |
| Sisters of Mercy of St. Borromeo of Emmaus | Borromean Sisters |
| Sisters of Mercy of St. Borromeo of Haifa | Borromean Sisters | 1888 |
| Sisters of Mercy of St. Borromeo of Jerusalem | Borromean Sisters | 1886 |
| Sisters of Mercy of St. Borromeo of Maastricht | Fr. Peter Anton van Baer | Borromean Sisters | 1837 |
| Sisters of Mercy of St. Borromeo of Nancy | Borromean Sisters | 1626 |
| Sisters of Mercy of St. Borromeo of Prague | Prince-Bishop Alois Josef, Freiherr von Schrenk | Borromean Sisters | 1838 |
| Sisters of Mercy of St. Borromeo of Trebnitz | Prince-Bishop Melchior, Freiherr von Diepenbrock | Borromean Sisters | 1848 |
| Sisters of Mercy of St. Borromeo of Trier | Nancy Borromean Sisters | Borromean Sisters | 1811 |
| Sisters of Mercy of the Union (Great Britain) | R.S.M. | Sisters of Mercy | 1976 |
| Sisters of Mercy of Verona | I.S.M. | Charles Steeb, Luigia Poloni | 1840 |
| Sisters Minor of Mary Immaculate | Fr. Elia M. Bruson, OFM Conv. and Mother Maria Elisabetta Patrizi | 1983 |
| Sisters of Mission Service | S.M.S. | Fr. Godfrey W. Kuckartz, OMI | 1951 |
| Sisters of Notre Dame de Namur | S.N.D./ S.N.D. de N. | Julie Billiart | 1803 |
| Sisters of Our Lady of Consolation | Augustinian |
| Sisters of Our Lady of Sion | N.D.S. | Frs. Marie Theodor Ratisbonne & Marie-Alphonse Ratisbonne | Congregation of Our Lady of Sion | 1843 |
| Sisters of the Poor, Palazzolo Institute | S.d.P.I.P. | Luigi Maria Palazzolo | 1869 |
| Sisters of the Presentation of Mary | P.M. | Blessed Anne-Marie Rivier | 1796 |
| Sisters of Providence of St. Mary-of-the-Woods | S.P. | Theodore Guerin | 1840 |
| Sisters of Providence of St. Vincent de Paul | S.P. | 4 Sisters of Charity of Montreal | Vincentian-Setonian | 1861 |
| Sisters of the Reparation of the Holy Face | Ven. Hildebrand Gregori | Benedictine | 1950 |
| Sisters of La Retraite | Mother Catherine de Francheville | 1674 |
| Sisters of Sacred Sciences | S.S.S. | Fr.Antony Kolencherry | 1997 |
| Sisters of St. Agnes | Caspar Rehrl | 1858 |
| Sisters of St. Benedict of Our Lady of Grace |
| Sisters of St. Casimir | S.S.C. | Mother Maria Kaupas | 1907 |
| Sisters of St. Chretienne | S.S.Ch. | Anne Victoire de Mejanes Tailleur | 1807 |
| Sisters of St. Dorothy (Dorotheans) | S.S.D. | Paula Frassinetti | 1834 |
| Sisters of St. Elizabeth | Mother Dorothea Wolff | 1842 |
| Sisters of St. Francis of Assisi | 37 Franciscan Sisters of Perpetual Adoration | Franciscan | 1873 |
| Sisters of St. Francis of Assisi | Franciscan | 1849 |
| Sisters of St. Francis of Penance and Christian Charity | Mother Magdalen Damen | Franciscan | 1835 |
| Sisters of St. Francis of Rochester, Minnesota | Sister Mary Alfred Moes | Franciscan | 1877 |
| Sisters of St. Joan of Arc | Augustinian |
| Sisters of St. John the Baptist | C.S.J.B. | 1876 |
| Sisters of St Joseph (Sisters of Saint Joseph of Medaille) | C.S.J. | Fr. Jean Paul Médaille | 1650 |
| Sisters of St. Joseph of the Apparition | St. Emily de Vialar | 1832 |
| Sisters of St. Joseph of Chambéry | Sisters of St. Joseph of Lyons | 1812 |
| Sisters of St. Joseph of Peace | C.S.J.P. | Margaret Anna Cusack | 1884 |
| Sisters of St. Joseph of Springfield |
| Sisters of St. Joseph of the Sacred Heart | S.S.J. | 1866 |
| Sisters of St. Joseph of Tarbes | S.J.T. |
| Sisters of St. Joseph the Worker | S.J.W. |
| Sisters of St. Louis | S.S.L. |
| Sisters of St. Martha | C.S.M. | Bishop John Cameron | Vincentian-Setonian | 1900 |
| Sisters of St. Mary of Oregon | S.S.M.O. | 9 Oregonian women | 1886 |
| Sisters of St. Paul Third Order Regular | C.S.P.T.O.R. | Paulist |
| Sisters of St. Peter Claver (India) | S.S.P.C. |
| Sisters of St. Rita | Fr. Hugolinus Dach, O.S.A. | Augustinian | 1911 |
| Sisters of St. Therese of the Child Jesus (St. Therese Sisters) | S.S.Th. | Maria Crocifissa Curcio | 20th century |
| Sisters of the Society Devoted to the Sacred Heart | S.D.S.H. | 1941 |
| Sister Servants of the Eternal Word of Birmingham, Alabama | S.S.E.W. |
| Sisters, Servants of the Immaculate Heart of Mary (Monroe, Michigan) | I.H.M. | Fr. Louis Florent Gillet, C.Ss.R., Mother Marie Theresa Duchemin and Mother Theresa Maxis | Immaculate Heart of Mary | 1845 |
| Sisters, Servants of the Immaculate Heart of Mary (Chester County, Pennsylvania) | I.H.M. | St. John Neumann and Mother Marie Theresa Duchemin | Immaculate Heart of Mary | 1858 |
| Sisters, Servants of the Immaculate Heart of Mary (Scranton, Pennsylvania) | I.H.M. | Immaculate Heart of Mary | 1871 |
| Sisters, Servants of the Lord and the Virgin of Matará | S.S.V.M. | 1988 |
| Sisters, Servants of the Most Sacred Heart of Jesus | S.S.C.J. | 1894 |
| Sisters of Social Service | S.S.S. | Mother Margit Slachta | Benedictine | 1923 |
| Slav Congregation | O.S.B. | Benedictine | 1945 |
| Snehagiri Missionary Sisters | S.M.S. | Fr. Abraham Kaippanplackal | 1963 |
| Society of African Missions (S.M.A. Fathers) | S.M.A. | Fr. Melchior de Marion Brésillac | 1850 |
| Society of the Atonement (Atonement Friars, Graymoor Friars) | S.A. | 1909 |
| Society of Bethlehem Mission Immensee | S.M.B. | 1921 |
| Society of Bethlemite Sisters | Bethl. |
| Society of Christ Fathers (The Society of Christ Fathers for Poles Living Abroad) | S.Chr. | Cardinal August Hlond and Fr. Ignacy Posadzy | 1932 |
| Society of the Divine Word | S.V.D. | St. Arnold Jansen | 1875 |
| Society of the Helpers of the Holy Souls | A.P./ H.H.S. | Blessed Eugenia Smet | 1856 |
| Society of the Holy Child Jesus | S.H.C.J. | Mother Cornelia Connelly | 1846 |
| Society of Marian Servants of Jesus | S.M.S.J. | 2010 |
| Société des Missions-Étrangères du Québec | P.M.E. | 1921 |
| Society of the Missionaries of St. Francis Xavier | S.F.X. | Fr. Jose Mariano Bento Martins | 1887 |
| Society of the Missionary Servants of the Poor | M.S.o.P. | 2008 |
| Society of Our Lady of the Most Holy Trinity | S.O.L.T. | Fr. James H. Flanagan | Trinitarian | 1958 |
| Society of St. Augustine (Kansas Augustinians) | S.S.A. | 4 Augustinian Recollects | Augustinian | 1981 |
| Society of St. Edmund (Edmundians) | S.S.E. | Fr. Jean Baptiste Muard | 1843 |
| Society of St. John | S.S.J. |
| Society of St. Paul (Paulines) | S.S.P. | Blessed Giacomo Alberione | Pauline | 1914 |
| Society of St. Pius X | S.S.P.X. | Archbishop Marcel Lefebvre | 1970 |
| Society of St. Vincent de Paul | S.V.d.P./ S.V.P./ S.S.V.D.P. | Blessed Antoine-Frédéric Ozanam | Vincentian-Setonian | 1833 |
| Society of the Sacred Heart | R.S.C.J. | St. Madeleine Sophie Barat | 1800 |
| Sisters of the Society of St. Pius X | Archbishop Marcel Lefebvre | 1974 |
| Sodality of Christian Life (Sodalicio de Vida Christiana) | S.C.V. | 1971 |
| Solesmes Congregation | O.S.B. | Pope Gregory XVI | Benedictine | 1837 |
| Sons of the Holy Family | S.F. | Fr. Josep Manyanet i Vives | 1864 |
| Sons of Mary Health of the Sick | F.M.S.I | Fr. Edward F. Garesche, SJ | 1952 |
| Sons of Merciful Love | F.A.M. | Sr. Esperanza Jesus Alhama Valera | 1951 |
| Sovereign Military Order of Malta | S.M.O.M. | Blessed Gerard Thom | 1099 |
| Spanish Institute of St. Francis Xavier for Foreign Missions | I.E.M.E. | Xaverian |
| Stigmatines (Congregation of the Sacred Stigmata) | C.S.S. | St. Gaspar Bertoni | 1816 |
| Subiaco Cassinese Congregation | O.S.B. | Dom Pietro Casaretto | Benedictine | 1867 |
| Sulpician Fathers (Society of Saint-Sulpice) | P.S.S. (In U.S.: S.S.) | Fr. Jean-Jacques Olier | 1642 |
| Swiss Congregation | O.S.B. | Benedictine | 1602 |
| Swiss-American Congregation | O.S.B. | Pope Leo XIII | Benedictine | 1881 |
| Sylvestrine Congregation | O.S.B. Silv. | St. Sylvester Gozzolini | Benedictine | 1231 |