Route 240 is a short south–north state highway in southeastern Massachusetts.

Route 240 acts as a connector between U.S. Route 6 and I-195 in Fairhaven. There are ghost ramps at the northern end of the highway that show that Route 240 was intended to continue north of I-195 to Acushnet, which was originally planned in the 1970s, but lost traction over the years. This is visible from an aerial view. Most maps indicate that this divided highway is one that has limited access, but that is not true as there is an at-grade intersection with traffic signals at Bridge Street, just north of U.S. 6.