Vermont Route 125 (VT 125) is a 35.901-mile-long (57.777 km) east–west state highway in Addison County, Vermont, United States. The route begins at an intersection for VT 17 in the town of Addison near the Champlain Bridge. The route runs through the towns of Bridport, Middlebury, Ripton and the Green Mountain National Forest before reaching a junction with VT 100 in Hancock. Parts of VT 125 from Bridport to Middlebury were designated as Vermont Route F-8 by 1926, but was truncated by 1931 to a segment between West Bridport and VT 30A. The section between VT 30A and Middlebury had been designated as Vermont Route 19. VT 19 began at VT 17 in Chimney Point, terminating at VT 30 in Middlebury. VT 125 had been designated between US 7 in Middlebury to VT 100 in Hancock by 1935, but by 1949, had absorbed the entirety of VT 19 to Chimney Point.

Addison County is a county located in the U.S. state of Vermont. As of the 2020 census, the population was 37,363. Its shire town is the town of Middlebury.