Glen Head is a hamlet and census-designated place (CDP) located within the Town of Oyster Bay in Nassau County, on the North Shore of Long Island, in New York, United States. It is considered part of the greater Glen Cove area, which is anchored by the City of Glen Cove. The population was 4,837 at the 2020 census.

The Town of Oyster Bay is the easternmost of the three towns that make up Nassau County, New York, United States. Part of the New York metropolitan area, it is the only town in Nassau County to extend from the North Shore to the South Shore of Long Island. As of the 2020 census, it had a population of 301,332, Making it the 5th most populous city or town in the state.