South Carolina Highway 311 (SC 311) is a 9.250-mile-long (14.886 km) state highway in the southeastern part of the U.S. state of South Carolina.

The highway travels in a west-to-east orientation from Sandridge, which is approximately six miles (9.7 km) southeast of Holly Hill, to a point approximately four miles (6.4 km) south of Cross.

SC 311 begins at an intersection with U.S. Route 176 (US 176) in Sandridge.

The route heads northeast, and then east to its eastern terminus, an intersection with SC 6, south of Cross.

[2] SC 311 is not part of the National Highway System, a system of roadways important to the nation's economy, defense, and mobility.