List of museums on Long Island

This list of museums on Long Island is a list of museums in Nassau County, New York and Suffolk County, New York.. Museums that exist only in cyberspace are not included. Also included are non-profit art centers and galleries.

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
Museum of Long Island Natural Sciences, formerly operated by Stony Brook University