State Route 171 (SR 171) is an American 73.355-mile (118.053 km) state highway that serves as a north-south connection between Northport and Hamilton through Fayette, Marion and Tuscaloosa Counties.

[2] From this point, SR 171 travels in a northerly direction through rural portions of northern Tuscaloosa County en route to Fayette.

[3][4] The route continues in its northerly track and intersects US 78 and I-22 en route to its northern terminus at SR 17 in Hamilton.

[5] Additionally, between Fayette and its northern terminus SR 171 has a 37.869-mile (60.944 km) concurrency with US 43.

[1] This route serves as an effective bypass of Berry and Stough for travelers on US 43, maintaining a north-to-south route while US 43 heads east-to-west to SR 18 East and SR 13 North near Berry, where US 43 returns to its main configuration towards Tuscaloosa.