Octave of the Nativity or Octave of Christmas may refer to:

• the eighth day (inclusive counting) from the celebration of the birth of Jesus on Christmas: 1 January, which is marked also by celebration of the Solemnity of Mary, Mother of God, or, in earlier calendars, the Feast of the Circumcision of Christ
• the whole eight-day period from 25 December to 1 January

• The Montgomery County Bulletin
• The Montgomery (San Francisco)
• The Month
• The Monthly Register
• The Monthly review
• The month of November
• The Month of the Falling Leaves
• The Montoya Sisters
• The Montreal Alouettes
• The Montreal Games
• The Montreal Gazette.
• The Montreal Islands
• The Montreal Light, Heat and Power Company (MLH&P)
• The Montreal Star
• The Montreux Album
• The Montreux EP
• The Montrose
• The Montrose Area School District
• The Montrose Avenue
• The Montrreal Games
• The Monty (band)
• The Monty Python Show Wide World: Special
• The monument aux morts of the Eastern Somme
• The monument aux morts of the Western Somme
• The Monument of Light