Route 177 is a provincial highway in the southwestern portion of the Canadian province of New Brunswick.

Its main purpose is to serve the town of Grand Bay-Westfield.

Route 177 is known as River Valley Drive in the former town of Grand Bay, and Nerepis Road in the former village of Westfield.

In these sections, those street names are used for civic addresses.

This was Route 177's northern terminus; however, since the construction of the Welsford Bypass, the route continues north on Nerepis Road through Sagwa, and Welsford.