South Nyack is a hamlet and census-designated place in the town of Orangetown in Rockland County, New York, United States. It is located north of Grand View-on-Hudson, northeast of Orangeburg, east of Blauvelt State Park, south of Nyack and west of the Hudson River. The hamlet is the western terminus of the Tappan Zee Bridge. Its population was 3,510 at the 2010 census. The hamlet was formerly incorporated as a village from 1878 until 2022.

Orangetown is a town in Rockland County, New York, United States, located in the southeastern part of the county. It is northwest of New York City, north of New Jersey, east of the town of Ramapo, south of the town of Clarkstown, and west of the Hudson River. The population was 48,655 at the 2020 census.