State Highway 4, abbreviated as SH-4 or OK-4, is a designation for two distinct highways maintained by the U.S. state of Oklahoma. One of them serves as an important route through the suburbs west of Oklahoma City, while the other connects US-259 to the Arkansas state line west of Cove, Arkansas. SH-4 has no lettered spur routes.

U.S. Route 259 is a north–south spur of U.S. Route 59 that runs for 250 miles (400 km) through rural areas of northeastern Texas and southeastern Oklahoma. The highway's southern terminus is near Nacogdoches, Texas, at an interchange with its parent route, US 59. Its northern terminus is in the Ouachita Mountains, approximately 15 miles (24 km) south of Heavener, Oklahoma, where it reunites with US 59. For most of its length, US 259 lies 30–50 miles (48–80 km) to the west of its parent route.