List of museums on Long Island

• Museums

Defunct museums

• Dinosaur Walk Museum, Riverhead, closed in 2008, branches still exist in Pigeon Forge, Tennessee and Branson, Missouri
• Goudreau Museum of Mathematics in Art and Science, New Hyde Park, closed in 2006
• Greenwood Museum
• Museum of Long Island Natural Sciences, formerly operated by State University of New York at Stony Brook