Walnut Creek is a 30-mile-long (48 km)[1] tributary of the South River in the U.S. state of Georgia.

It originates in the city of Hampton in Henry County and flows into South River, which is a branch of the Ocmulgee River.

Walnut Creek is dammed to provide a water source for the city of McDonough in Henry County.

The name of the resulting body of water is called Fargason Reservoir.

[2] The crossings over Walnut Creek are listed in descending order from the creek's source to its mouth at the South River.