New York State Route 37B (NY 37B) is an east–west state highway located in St. Lawrence County, New York, in the United States. It serves as a business route of NY 37 through the village of Massena. While NY 37B enters the village, NY 37 bypasses it to the south. The western terminus of the route is at an intersection with NY 37 in the town of Louisville. Its eastern terminus is at a junction with NY 37 just east of the village limits in the town of Massena. NY 37B intersects North Main Street, a state-maintained northward extension of NY 420, in Massena's central district.

New York State Route 37 (NY 37) is a state highway in the North Country of New York in the United States, extending for 127.40 miles (205.03 km) on a west–east axis. The western terminus of the route is at an intersection with U.S. Route 11 (US 11) in Pamelia, Jefferson County. Its eastern terminus is at a junction with US 11, NY 11B, and NY 30 in Malone, Franklin County. In between the termini, NY 37 passes through Ogdensburg and Massena. It is a two-lane, nondivided, full access roadway for most of its entire length, except for portions between Massena and western Franklin County, where the route widens to a four-lane divided highway.