State Route 158 (SR-158) is a 10-mile-long (16 km) state highway in northern Mobile County in the southwestern corner of the U.S. state of Alabama. The western terminus of the route is at its intersection with Schillinger Road near Semmes. The eastern terminus of the route is at its intersection with U.S. Route 43 (US-43) at Saraland. The route will eventually become part of US-98 west of Mobile to the Alabama–Mississippi state line as a 4-lane bypass of Semmes.