State Route 172 (SR 172) is part of Maine's system of numbered state highways, located in Hancock County.

It runs from SR 175 in Sedgwick to U.S. Route 1 (US 1) and SR 3 in Ellsworth.

[2] The route is 22.65 miles (36.45 km) long.

The entire route is in Hancock County.

This Maine road or road transport-related article is a stub.