State Route 158 (SR 158) is a 9.28-mile-long (14.93 km) state highway in northern Mobile County in the southwestern corner of the U.S. state of Alabama. The western terminus of the highway is at an intersection with Newburn Road in Semmes. The eastern terminus of the highway is at an intersection with U.S. Route 43 (US 43) at Saraland. The route will eventually become part of US 98 west of Mobile to the Mississippi state line as a four-lane bypass of Semmes.