New York State Route 210 (NY 210) is a state highway in Orange County, New York, in the United States. It runs north from the New Jersey state line—where it continues south as Passaic County Route 511 (CR 511)—along the west shore of Greenwood Lake to the eponymous village of Greenwood Lake, where it ends at a junction with NY 17A. It was once much longer, as it originally extended east along NY 17A and CR 106 in Orange and Rockland counties to Stony Point when it was assigned as part of the 1930 renumbering of state highways in New York. The route was truncated to its current length in 1982. Prior to becoming NY 210 in 1930, the road alongside Greenwood Lake was part of NY 55, a route connecting New Jersey to Goshen, in the 1920s.

County Route 511 is a county highway in the U.S. state of New Jersey. The highway extends 37.44 miles (60.25 km) from Columbia Avenue in Morris Township to the New York state line in West Milford where the road continues as New York State Route 210.