New York State Route 342 (NY 342) is a short east–west state highway in Jefferson County, New York, in the United States. The western terminus of NY 342 is at an intersection with NY 12 near the hamlet of Scoville Corners in the town of Pamelia. The eastern terminus is at a junction with NY 3 in the town of Le Ray, west of the village of Black River. Along the way, NY 342 connects to Interstate 81 (I-81) in Pamelia and intersects U.S. Route 11 (US 11) outside of the Le Ray hamlet of Calcium.