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 in the boroughs of Queens and Brooklyn, which are also physically located on Long Island, are found in List of museums in New York City). Museums that exist only in cyberspace (i.e., virtual museums) 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
 * Greenwood Museum
 * Museum of Long Island Natural Sciences, formerly operated by Stony Brook University.