New York State Route 133 (NY 133) is an 8.71-mile (14.02 km) long state highway in Westchester County, New York, in the United States. It begins at U.S. Route 9 (US 9) in the village of Ossining, goes through several hamlets in the town of New Castle (Millwood and Tompkins Corners), and ends at NY 117 in the village of Mount Kisco.