New York State Route 39 (NY 39) is an east–west state highway in the western portion of New York in the United States. It begins and ends at intersections with U.S. Route 20 (US 20) apart. The western terminus of NY 39 is east of Fredonia in the Chautauqua County town of Sheridan, while the eastern terminus is in the Livingston County village of Avon. At its east end, NY 39 also ends at NY 5, which is concurrent to US 20 at this point. NY 39 serves several villages, including Gowanda and Geneseo, and intersects a handful of major north–south highways, such as US 219 in Springville and NY 19 near Pike. Most of the route is a two-lane highway that passes through rural, undeveloped areas.