Massachusetts Route 177, is a short west-east state highway in Massachusetts. It starts as an offshoot of US-6 in the Westport Factory neighborhood of Westport, just northwest of the UMASS Dartmouth main campus in Dartmouth; Massachusetts Route 177 runs south through the town of Westport to the Massachusetts/Rhode Island state boundary, where Route 177 continues over the Massachusetts state boundary into the town of Tiverton, Rhode Island as Rhode Island State Highway 177.

Route 177 crosses the following route:

• Route 88 in Westport

Numbered routes in Massachusetts