Islandia is a village in Suffolk County, New York, United States. The population was 3,057 at the 2000 census.
The Village of Islandia is in the northern part of the Town of Islip.
Islandia straddles the Long Island Expressway and is near the geographic center of Long Island. It has no central business district, although it is home to the Islandia Center, home to a Wal-Mart and Dave & Busters. It was established in 1985 after CA Technologies established its world headquarters in the community creating a high tech boom town.