North Amityville is a hamlet and census-designated place (CDP) in the Town of Babylon in Suffolk County, on the South Shore of Long Island, in New York. The population was 18,643 at the 2020 Census.

The Town of Babylon is one of ten towns in Suffolk County, New York, United States. Its population was 218,223 as of the 2020 census. Parts of Jones Beach Island, Captree Island and Fire Island are in the southernmost part of the town. It borders Nassau County to the west and the Atlantic Ocean to the south. At its westernmost point, it is about 20 miles (32 km) from New York City at the Queens border, and about 30 miles (48 km) from Manhattan. The village of Babylon is also within the town.