New York State Route 9N (NY 9N) is a north–south state highway in northeastern New York in the United States. It extends from an intersection with U.S. Route 9 (US 9), NY 29, and NY 50 in the city of Saratoga Springs to a junction with US 9 and NY 22 in the Clinton County hamlet of Keeseville. At in total length, NY 9N is the longest letter-suffixed route in the state. It is concurrent with its parent route for in the village of Lake George and for three blocks in the hamlet of Elizabethtown.