SS Robert Mills was a Liberty ship built in the United States during World War II. She was named after Robert Mills, a South Carolina architect known for designing both the first Washington Monument, located in Baltimore, Maryland, as well as the better known Washington Monument in the nation's capital, Washington, D.C.

Robert Mills was laid down on August 30, 1944, under a Maritime Commission (MARCOM) contract, MC hull 2498, by the St. Johns River Shipbuilding Company, Jacksonville, Florida; she was sponsored by Mrs. Cecil L. McCall, the wife of St. Johns River SBC's leaderman, and was launched on 5 October 1944.

She was allocated to the Alcoa Steamship Co., Inc. on October 14, 1944. On October 21, 1948, she was laid up in the National Defense Reserve Fleet in Mobile, Alabama. She was transferred for use as an artificial reef, May 21, 1975, to the state of Alabama. She was removed from the fleet, 28 May 1975. She was sunk 24 October 1975, at 30°04′6″N 88°06′45″W / 30.06833°N 88.11250°W / 30.06833; -88.11250.