Vermont Route 15 (VT 15) is a 68.957-mile-long (110.976 km) east–west state highway in northern Vermont, United States. Its western terminus is at U.S. Route 2 (US 2) and US 7 in Winooski and its eastern terminus is at US 2 in Danville. It is known as the Grand Army of the Republic Highway, a designation shared nationally with U.S. Route 6. Its numbering originates from when it was part of New England Interstate Route 15 in the 1920s. Most of New England Route 15 is now U.S. Route 2 (from Danville, Vermont to Houlton, Maine).