Ruby is a town in Chesterfield County, South Carolina, United States.

The Cheraw & Lancaster Railroad arrived in 1902, and Ruby incorporated the same year.

[6][7] Ruby has annual celebrations: the Jewel City Jubilee and the Fourth of July Parade and Fireworks.

[8] South Carolina Highway 9 passes through the town, leading east 6 miles (10 km) to Chesterfield, the county seat, and northwest 3 miles (5 km) to Mount Croghan.

According to the United States Census Bureau, Ruby has a total area of 2.5 square miles (6.4 km2), all land.