| Name | Location | County | Type | Summary |
|---|
| 1901 Depot and Freight house | Lindenhurst | Suffolk | Railroad | [https://villageoflindenhurstny.gov/village-of-lindenhurst-services/lindenhurst-historical-society/the-old-depot-at-irmisch-park-village-of-lindenhurst/ website] Restored Lindenhurst depot, freight house, and various railroad equipment for show. Includes historical pictures of the local area. |
| African American Museum of Nassau County | Hempstead | Nassau | African American | History of African-Americans on Long Island and the African-American contribution to the social and cultural development of American society |
| Alan and Helene Rosenberg Jewish Discovery Museum | Commack | Suffolk | Ethnic – Jewish | [https://web.archive.org/web/20150429001133/http://www.suffolkyjcc.org/html/discoverymuseum.shtml website], part of the Suffolk Y JCC, Jewish life, history, values, traditions and heroes, as well as Israel and the Hebrew language |
| Amelia Cottage Museum | Amagansett | Suffolk | Local history | Operated by the Amagansett Historical Society |
| American Airpower Museum | East Farmingdale | Suffolk | Aviation | Features flying World War II aircraft manufactured by Republic Aviation |
| American Merchant Marine Museum | Kings Point | Nassau | Maritime | Marine art and artifacts, National Maritime Hall of Fame |
| Babylon Library Museum | Babylon | Suffolk | Local history | website, operated by the Babylon Village Historical and Preservation Society; Listed on NRHP since August 10, 2015 |
| Baldwin Historical Museum | Baldwin | Nassau | Local history | website, operated by the Baldwin Historical Society |
| Bayport Aerodrome | Bayport | Suffolk | Aviation | Historic flying aircraft |
| Bayville Historical Museum | Bayville | Nassau | Local history | [https://www.facebook.com/pages/Bayville-Historical-Museum/222637504446255 Facebook site], open by appointment |
| Bellport-Brookhaven Historical Society Museum Complex | Farmingdale | Nassau | Open air | website, includes an 1833 house, blacksmith shop, boathouse, milk house, collections of Sperry gyroscopes, decoys, antique tools, wedding gowns, dolls and toys from the mid 1800s |
| Bohemia Historical Society Museum | Bohemia | Suffolk | Local history | website |
| Bridgehampton Museum | Bridgehampton | Suffolk | Local history | website, operated by the Bridgehampton Historical Society, will include the Nathaniel Rogers House |
| Brookhaven National Laboratory Science Learning Center | Brookhaven | Suffolk | Science | website |
| Brookhaven Volunteer Firefighters Museum | Ridge | Suffolk | Firefighting | website |
| Caleb Smith State Park Preserve | Smithtown | Suffolk | Multiple | 543-acre park, features a museum with exhibits about the preserve's history, nature and ecosystems |
| Cedarmere | Roslyn Harbor | Nassau | Historic house | Early 20th-century mansion, former estate of poet and journalist William Cullen Bryant |
| Children's Museum of the East End | Bridgehampton | Suffolk | Children's | website |
| Clinton Academy | East Hampton | Suffolk | Education | website, operated by the East Hampton Historical Society, adjacent to Town House |
| Cold Spring Harbor Fire House Museum | Cold Spring Harbor | Suffolk | Firefighting | website, firefighting equipment, vehicles, uniforms |
| Cradle of Aviation Museum | Garden City | Nassau | Aviation |
| Custom House (Sag Harbor, New York) | Sag Harbor | Suffolk | Historic house | Restored late 18th-century house, operated by the Society for the Preservation of Long Island Antiquities |
| Cutchogue Village Green | Cutchogue | Suffolk | Open air | website, includes Old House (Cutchogue), operated by the Cutchogue-New Suffolk Historical Council |
| David Conklin Farmhouse Museum | Huntington | Suffolk | Historic house | Operated by the Huntington Historical Society, illustrates three periods of the country's history: Colonial, Federal and Victorian |
| Davis Town Meeting House | Coram | Suffolk | Historic House | website Historic building that served as the town meeting place for the Town of Brookhaven, for most of the 19th century. |
| Dolan DNA Learning Center | Cold Spring Harbor | Suffolk | Science | Educational science center of Cold Spring Harbor Laboratory |
| Dr. Daniel Kissam House Museum | Huntington | Suffolk | Historic house | website, operated by the Huntington Historical Society |
| Earle-Wightman House | Oyster Bay | Nassau | Historic house | Operated by the Oyster Bay Historical Society |
| East End Seaport Museum | Greenport | Suffolk | Maritime | website, operated by the Oyster Bay Historical Society; Located in former Greenport LIRR station house. |
| East Hampton Marine Museum | East Hampton | Suffolk | Maritime | website, operated by the East Hampton Historical Society |
| East Rockaway Grist Mill Museum | East Rockaway | Nassau | Local history | Located in a historic grist mill building |
| Edwards Homestead | Sayville | Suffolk | Local history | website, operated by the Sayville Historical Society |
| Falaise Mansion | Sands Point | Nassau | Historic house | website, mid 20th-century mansion of Harry Frank Guggenheim, located in Sands Point Preserve |
| Fire Boat Fire Fighter Museum | Greenport | Suffolk | Firefighting | website Docked and retired fireboat that is open to tours. |
| Fire Island Lighthouse | East Rockaway | Suffolk | Lighthouse |
| Firehouse Plaza Art Gallery | Garden City | Nassau | Art | website, part of Nassau Community College |
| Freeport Historical Museum | Freeport | Nassau | Local history | website, operated by the Freeport Historical Society |
| Gallery North | Setauket | Suffolk | Art | website, contemporary art in a variety of media: painting, drawing, printmaking, ceramics, sculpture, glass, metal and fiber |
| Garvies Point Museum and Preserve | Glen Cove | Nassau | Multiple | website, Long Island geology, Native American culture and archaeology, natural history |
| Guild Hall (Easthampton, New York) | East Hampton | Suffolk | Art | website, community arts center, includes the Guild Hall Museum with world-class art exhibitions of internationally renowned visual artists and emerging regional artists |
| Hallockville Museum Farm | Riverhead | Suffolk | Open air | 28|acre|m2}} of farmland, Hallock Homestead interpreted to 1880–1910 Victorian era |
| Halsey House | Southampton | Suffolk | Historic house |
| Havens House | Shelter Island | Suffolk | Historic house | Operated by the Shelter Island Historical Society |
| Heckscher Museum of Art | Huntington | Suffolk | Art | Focused mainly on American landscape paintings and work by Long Island artists, as well as featuring American and European modernism, and photography |
| Hicksville Gregory Museum | Hicksville | Nassau | Natural history | website, collections of fossils, butterflies, minerals and telephones, located in the Heitz Place Courthouse |
| Hofstra University Museum | Hempstead | Nassau | Art | Collection includes art, photography and ethnographic objects dating from 5,000 BCE to the contemporary period and representing 6 continents |
| Holocaust Memorial and Tolerance Center of Nassau County | Glen Cove | Nassau | History | History of the Holocaust, dangers of antisemitism, racism, bullying and other manifestations of intolerance |
| Home Sweet Home (New York) | East Hampton | Suffolk | Historic house | website |
| Hook Windmill | East Hampton | Suffolk | Mill | Restored 1736 windmill |
| Horton Point Lighthouse | Southold | Suffolk | Lighthouse | Operated by the Southold Historical Society |
| Islip Art Museum | East Islip | Suffolk | Art | website, contemporary. Housed in historic Brookwood Hall, a former orphanage and Georgian Revival home built in 1903.[1] |
| Islip Grange | Sayville | Suffolk | Open Air | Historic Long Island and Sayville websites |
| Jesse and Ira Tuthill Houses | Mattituck | Suffolk | Historic house | 18th and 19th-century period houses, operated by the Mattituck-Laurel Historical Society |
| Islip Town Firefighter Museum | Central Islip | Suffolk | Firefighting | website A showcase to highlight the rich history of the Fire & EMS agencies that have served the communities within the Town of Islip. |
| Joseph Lloyd Manor | Lloyd Harbor | Suffolk | Historic house | Operated by the Society for the Preservation of Long Island Antiquities, late 18th-century period manor house |
| Kings Park Heritage Museum | Kings Park | Suffolk | Local history | website |
| Lake Ronkonkoma Historical Society Museum | Lake Ronkonkoma | Suffolk | Local history | website |
| Lauder Museum | Amityville | Suffolk | Local history | website, operated by the Amityville Historical Society |
| Levittown Historical Museum | Levittown | Nassau | Local history | [https://www.facebook.com/pages/Levittown-Historical-Society-and-Museum/105024926209599 Facebook site], operated by the Levittown Historical Society |
| Long Beach Historical Museum | Long Beach | Nassau | Local history | Operated by the Long Beach Historical & Preservation Society |
| Long Island Children's Museum | Garden City | Nassau | Children's | website |
| Long Island Maritime Museum | West Sayville | Suffolk | Maritime | Exhibits include ship models, oyster industry, lifesaving and shipwrecks, sail and power boats, area Dutch heritage |
| Long Island Museum of American Art, History, and Carriages | Stony Brook | Suffolk | Multiple | American art, Long Island history, over 200 horse-drawn carriages |
| Long Island Psychiatric Museum | West Brentwood | Suffolk | Medical | History of the three Long Island hospitals (Kings Park, Central Islip, Pilgrim) that were active at one time and have since been merged with Pilgrim Psychiatric Center |
| Long Island Science Center | Riverhead | Suffolk | Science | website, hands-on science activities |
| LongHouse Reserve | East Hampton | Suffolk | Art | 16-acre sculpture garden reserve, created by Jack Lenor Larsen |
| Manor St. George | Ridge | Suffolk | Historic house | Longwood Estate |
| Maple Lane Museum Complex | Southold | Suffolk | Open air | website, operated by the Southold Historical Society, includes the Joseph Nelson Hallock House, Thomas Moore House, a print shop, blacksmith shop, farm equipment shed, barn, schoolhouse, ice house, corn crib and outhouses |
| Maritime Explorium | Port Jefferson | Suffolk | Maritime | website, hands-on science explorations of boats, sailing, lighthouses, boat building, navigation, nautical codes and more |
| Mather House Museum | Port Jefferson | Suffolk | Open air | Headquarters of the Port Jefferson Historical Society, complex of 5 historic buildings |
| Meadow Croft | Bayport | Suffolk | Historic house | Operated by the Bayport Heritage Association, late 19th century summer estate of John Ellis Roosevelt |
| Mill Neck Manor | Mill Neck | Nassau | Historic house | 20th-century Tudor Revival mansion, guided tours once a month by appointment |
| Montauk County Park | Montauk | Suffolk | Historic house | Includes 18th-century Third House, open seasonally |
| Montauk Point Lighthouse | Montauk | Suffolk | Maritime | Lighthouse and local history and maritime museum |
| Mulford Farmhouse | East Hampton | Suffolk | Living | Operated by the East Hampton Historical Society, 1790s period farm |
| Museum of American Armor | Old Bethpage | Suffolk | Military | website A collection of more than 35 operational armored vehicles from WW II that are presented for the purpose of honoring our armed forces and the nation's largest veterans population while offering an immersion experience for visitors who discover the heroes within their own families. |
| Nassau County Firefighters Museum and Education Center | Garden City | Nassau | Firefighting | website, located inside the Cradle of Aviation Museum |
| Nassau County Museum of Art | Roslyn Harbor | Nassau | Art | Includes 19th- and 20th-century European and American art, and a children's art museum |
| National Jewish Museum Sports Hall of Fame | Commack | Suffolk | Sports | American Jewish figures who have distinguished themselves in sports |
| Northport Historical Society and Museum | Northport | Suffolk | Local history | Located in the former library; Listed on NRHP since December 6, 1996 |
| Oheka Castle | Huntington | Suffolk | Historic house | Early 20th-century mansion, now a hotel, open for guided tours by reservation |
| Old Bethpage Village Restoration | Old Bethpage | Nassau | Living | Mid-19th-century farming village |
| Old House (Cutchogue) | Cutchogue | Suffolk | Historic house | Part of Cutchogue Village Green, operated by the Cutchogue-New Suffolk Historical Council |
| Old Village Hall Museum | Lindenhurst | Suffolk | Historic house | website, operated by the Lindenhurst Historical Society |
| Old Westbury Gardens | Old Westbury | Nassau | Historic house | Former estate of John Shaffer Phipp |
| Oyster Bay Railroad Museum | Oyster Bay | Nassau | Railroad | Museum under development, includes the Oyster Bay Long Island Rail Road Turntable |
| Oysterponds Historical Society Museum | Orient | Suffolk | Open air | website, includes the late 18th-century Village House with local history exhibits, 18th-century Webb House, late 19th-century schoolhouse |
| Pagan-Fletcher House | Valley Stream | Nassau | Historic house | Operated by the Valley Stream Historical Society |
| Parrish Art Museum | Southampton | Suffolk | Art | American art, with an emphasis on artists from Eastern Long Island |
| Phillips House Museum | Rockville Centre | Nassau | Historic house | website, [https://www.facebook.com/thephillipshousemuseumofrvc Facebook site], operated by the Rockville Centre Historical Society, restored Victorian house with exhibits of local history |
| Planting Fields Arboretum State Historic Park | Oyster Bay | Nassau | Historic house | 400|acre|km2}} |
| Polish American Museum | Port Washington | Nassau | Ethnic | Achievements of the people of Polish heritage in America, includes folk art, costumes, historical artifacts and paintings |
| Pollock-Krasner House and Studio | East Hampton | Suffolk | Biographical | House of Jackson Pollock |
| Railroad Museum of Long Island | Riverhead | Suffolk | Railroad | Also a location in Greenport |
| Raynham Hall Museum | Oyster Bay | Nassau | Historic house | Restored 22 room house reflecting the 1770s through the 1870s |
| Rock Hall Museum | Lawrence | Nassau | Historic house | Mid-18th-century period plantation-style house |
| Saddle Rock Grist Mill | Saddle Rock | Nassau | Mill | Restored tidal grist mill |
| Sag Harbor Fire Department Museum | Sag Harbor | Suffolk | Firefighting | Displays artifacts, murals, photographs, uniforms and equipment dating back to the year 1803 when the fire department was first established. |
| Sag Harbor Whaling & Historical Museum | Sag Harbor | Suffolk | Maritime | Town's whaling industry, whaling equipment, local history |
| Sagamore Hill National Historic Site | Cove Neck, New York | Nassau | Historic house | Home of Theodore Roosevelt, includes Roosevelt museum |
| Sagtikos Manor | West Bay Shore | Suffolk | Historic house | Operated by the Sagtikos Manor Historical Society, reflects construction and ownership from the 17th to the 20th centuries |
| Sands-Willets House | Port Washington | Nassau | Historic house | Operated by the Cow Neck Peninsula Historical Society |
| Science Museum of Long Island | Nassau | Suffolk | Science | website, hands-on science programs for children |
| Sea Cliff Village Museum | Sea Cliff | Nassau | Local history | Includes a Victorian kitchen, toy and doll collection |
| Sherwood-Jayne House | Setauket | Suffolk | Historic house | Maintained by the Society for the Preservation of Long Island Antiquities, 18th-century house |
| Shinnecock Nation Cultural Center & Museum | Southampton | Suffolk | Native American | website, history and culture of the Shinnecock Indian Nation |
| Smithtown Historical Society | Branch | Suffolk | Historic house | website, [https://www.facebook.com/pages/Smithtown-Historical-Society/175157752524891 Facebook site], open during programs and events, includes the Caleb Smith House, 1750 Judge John Lawrence Smith Homestead, 1700 Obadiah Smith House, barns |
| Society for the Preservation of Long Island Antiquities Museum Gallery | Cold Spring Harbor | Suffolk | Local history | website, housed in a former 1842 Methodist-Episcopal church building |
| Soldiers & Sailors Memorial Building | Huntington | Suffolk | Local history | [https://web.archive.org/web/20110726163339/http://www.huntingtonhistoricalsociety.org/soldiers_and_sailors.htm website], operated by the Huntington Historical Society |
| South Fork Natural History Museum and Nature Center | Bridgehampton | Suffolk | Natural history | website |
| Southampton Historical Museum | Southampton | Suffolk | Open air | website, operated by the Southampton Historical Society, includes the William Rogers Mansion, one-room schoolhouse, 1825 barn, 19th-century trade store, the 17th-century Halsey House, a 19th-century paint store, blacksmith's shop, cobbler's shop, |
| Southold Indian Museum | Southold | Suffolk | Native American | website, archaeological artifacts and culture of the Indians of Long Island, includes Algonquin pottery, arrowheads, knife blades, hoe blades, hammers, gouges, drills and other tools |
| Staller Center | Stony Brook | Suffolk | Art | Arts center of Stony Brook University, includes the Paul W. Zuccaire Gallery |
| Steinberg Museum of Art at Hillwood | Brookville | Nassau | Art | Part of Long Island University, temporary exhibitions that span from antiquity to contemporary art |
| Stony Brook Grist Mill | Stony Brook | Suffolk | Mill |
| Suffolk County Historical Society Museum | Riverhead | Suffolk | Local history | Exhibits include 18th to 20th-century paintings and furniture, whaling, farming, early transportation, local ceramics, military artifacts |
| Suffolk County Farm and Education Center | Yaphank | Suffolk | Farm | [https://web.archive.org/web/20141022204239/http://ccesuffolk.org/farm website], operated by Cornell Cooperative Extension, working farm with education programs |
| Suffolk County Police Museum | Yaphank | Suffolk | Law enforcement | [https://web.archive.org/web/20110927021640/http://www.co.suffolk.ny.us/police/historicalsociety.htm website] |
| Suydam House | Centerport | Suffolk | Historic house | Operated by the Greenlawn-Centerport Historical Association, 18th-century house and local history exhibits |
| Swan River Schoolhouse | East Patchogue | Suffolk | School | website, operated by the Greater Patchogue Historical Society, historic schoolhouse |
| Tackapausha Museum and Preserve | Seaford | Nassau | Natural history | website, live animals, displays about the ecology of Long Island |
| Theodore Roosevelt County Park | Montauk | Suffolk | Military | Includes exhibits about the Spanish–American War, the Rough Riders and Camp Wikoff |
| Thomas Dodge House | Port Washington | Nassau | Historic house | Operated by the Cow Neck Peninsula Historical Society |
| Three Village Historical Society | Setauket | Suffolk | Local history | website |
| Town House | East Hampton | Suffolk | Education | website, operated by the East Hampton Historical Society, adjacent to Clinton Academy |
| Tuthill House Museum | Westhampton Beach | Suffolk | Historic house | website, operated by the Westhampton Beach Historical Society |
| Vanderbilt Museum | Centerport | Suffolk | Multiple | Historic mansion with collections of natural history, marine, weaponry and ethnographic objects |
| Verizon Telecom Pioneer Museum | Commack | Suffolk | Technology | Also known as Long Island Telephone Pioneers Museum,established by the Long Island Chapter of the Telephone Pioneers of America[2][3][4] |
| Walt Whitman Birthplace State Historic Site | West Hills | Suffolk | Historic house |
| Wantagh Museum | Wantagh | Nassau | Railroad | Historic railroad station, car and post office |
| Water Mill Museum | Water Mill | Suffolk | Mill | Colonial water-powered grist mill |
| The Whaling Museum & Education Center | Cold Spring Harbor | Suffolk | Maritime | Whaling and maritime history of Long Island, relationship between people and the ocean |
| William Floyd House | Mastic | Suffolk | Historic house | Signer of the Declaration of Independence, part of Fire Island National Seashore |
| William Miller House | Miller Place | Suffolk | Historic house | website, early 18th-century house, operated by the Miller Place-Mount Sinai Historical Society |
| Wrong Island Railroad | Lake Ronkonkoma | Suffolk | Railroad | website, operating model train display and museum featuring O-gauge trains |
|
1. ^{{cite web |title=Grand House, Home to Many, Reveals Itself |url=https://www.nytimes.com/2010/10/24/nyregion/24artsli.html |website=New York Times |accessdate=23 March 2019}}
2. ^{{cite web|title=New Vision Pioneer Museum|url=http://www.newsday.com/entertainment/long-island/museums/new-vision-pioneer-museum-1.807174|publisher=Newsday|accessdate=25 February 2016}}
3. ^{{cite web|title=Verizon Pioneers: Loyalty and Fellowship through Public Service|url=http://forums.verizon.com/t5/Verizon-at-Home/Verizon-Pioneers-Loyalty-and-Fellowship-through-Public-Service/ba-p/547709|publisher=Verizon|accessdate=25 February 2016|date=March 7, 2013}}
4. ^{{cite web|title=Inside Ken Goslin's Man Cave: The telephone collection that helped 'save' Lincoln's Fire Department|url=https://www.youtube.com/watch?v=rLXBjIOFnuM|publisher=YouTube|accessdate=25 February 2016|date=December 7, 2012}}
5. ^http://www.mathfactory.org/Goudreau+Museum Museum of Mathematics