Route 37 is a 9.54-mile-long (15.35 km) north–south state highway in eastern Massachusetts.

After crossing the Middleboro-Lakeville Line and passing the Montello Station, it enters the town of Holbrook.

As Franklin Street, it passes Sunset Lake, west of the town center, before going through the Five Corners neighborhood.

It then passes the Quincy Reservoir and South Shore Plaza before ending at I-93/US 1's Exit 6, just west of the Braintree Split.

Route 37 was truncated to its current northern terminus by 1959 following the completion of the Southeast Expressway (current I-93/US 1/Route 3), formerly extending along Willard Street through Quincy and Granite Avenue through East Milton before ending at Gallivan Boulevard (now Route 203) in the Neponset neighborhood of Boston.