Thompson Turnpike

Route 131
Map of southern Massachusetts with MA 131 highlighted in solid red and of northeastern Connecticut with CT 131 highlighted in dotted red
Route information
Length:	13.55 mi (21.81 km) Connecticut: 3.78 mi Massachusetts: 9.77 mi
Existed:	1923 (extended into Connecticut 1932) – present
Major junctions
West end:	US 20 in Sturbridge, MA
East end:	Route 12 in Thompson, CT
Location
Counties:	MA: Worcester CT: Windham
Highway system
Massachusetts State Highway System Interstate US State ← Route 130 MA Route 132 → ← Route 130 CT Route 132 →

Route 131 is a state highway in the U.S. states of Massachusetts and Connecticut. It serves the southwestern portion of the Worcester metropolitan area. It begins at Route 12 in the North Grosvenor Dale section of the town of Thompson in Connecticut and ends at U.S. Route 20 in the center of Sturbridge in Massachusetts.

Route 131 begins at U.S. Route 20 in Sturbridge, just west of where that route meets Interstate 84, and just south of I-84's terminus with Interstate 90. After crossing under I-84, Route 131 meets the former northern end of Route 15, which was a continuation of Connecticut Route 15. Route 131 continues southeastward into Southbridge, where it crosses the Quinebaug River. In downtown Southbridge, Route 131 meets the northern end of Route 198 before becoming concurrent with Route 169 for half a mile, south of the Southbridge Industrial Park and the old American Optical Company plant.