Route 148 is a south–north highway in central Massachusetts.

Route 148 begins at U.S. Route 20 in Fiskdale, a village in Sturbridge. The highway runs north under Interstate 90 (the Massachusetts Turnpike) without an intersection and past the Tantasqua Regional High School before entering Brookfield, where there is a very brief concurrency with Route 9 in the center of the town. Route 148 then enters North Brookfield and becomes concurrent with Route 67 through the center of the town. After the two highways diverge, Route 148 passes through the southeastern corner of New Braintree for less than 0.5-mile (0.80 km) and then enters Oakham, where the highway ends at Route 122.

Route 148 was extended after 1986 from the southern intersection with Route 67 in North Brookfield to Route 122 in Oakham; however, signage for the highway north of Route 67 is very spotty.