State Route 156 or SR-156 is a 7.186-mile (11.565 km) state highway that serves as a connection between Jachin and Pennington in northeastern Choctaw County. SR-156 intersects SR-17 at its western terminus and SR-114 at its eastern terminus.

State Route 156 begins at its intersection with SR-17 in Jachin. From this point the route travels in an easterly direction through its eastern terminus at SR-14 in Pennington.

The entire route is in Choctaw County.