New York State Route 129 (NY 129) is a 7.75-mile (12.47 km) long state highway in the western part of Westchester County, New York. The route begins at New York State Route 9A (South Riverside Avenue) in the village of Croton on Hudson at the Hudson River. NY 129 then travels through the towns of Cortlandt and Yorktown, running along the northern edge of the New Croton Reservoir. It passes under (southbound) and over (northbound) the Taconic State Parkway in Yorktown with no direct interchange. NY 129 ends in Yorktown at an intersection with NY 118.