Route 88 is a 11.30-mile-long (18.19 km) north–south state highway in the town of Westport in southeastern Massachusetts.

At just over 11 miles, it is the longest Massachusetts state route to be situated in only one town.

Route 88 begins at the northern end of the Horseneck Beach State Reservation lands, on a peninsula dividing the East Branch of the Westport River from Buzzards Bay.

After just 0.3 miles (0.48 km), it crosses the Normand Edward Fontaine Bridge over that river into the Westport Point section of town.

Route 88 ends just north of Route 6 and the abandoned Old Colony Rail line at an interchange with I-195, where westbound entrance and exit fly on separate overpasses over the interstate, and eastbound entrance and exit are direct ramps with no flyovers.