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.