South Carolina Highway 79 (SC 79) is a 9.340-mile (15.031 km) primary state highway in the U.S. state of South Carolina.

It connects communities in western Marlboro County.

SC 79 is a two-lane rural highway, traversing from SC 9 to the North Carolina state line where the road continues in Gibson, North Carolina as North Carolina Highway 79.

In 1938, it was replaced by SC 68, which later became a secondary road by 1948.

The current SC 79 was established in 1938 as a renumbering of part of SC 38, from Bennettsville to the North Carolina state line.