State Route 37 (SR 37) is a primary state highway in the U.S. state of Virginia. It forms a western bypass of Winchester, connecting to Interstate 81 (I-81) at both ends. Although the road is a freeway, neither I-81 connection is freeway standard; the south end (exit 310) is a diamond interchange with two traffic signals, while, at the north end, drivers must use a short piece of U.S. Route 11 (US 11) to connect with I-81 at exit 317. In addition to local access, the highway connects to US 50 and US 522, two major highways that lead west and northwest into West Virginia and north to Interstate 70 at Hancock, Maryland. An eastern bypass, known locally as "Route 37 East", has been proposed in statewide and local plans to complete the loop.

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