USS Watonwan (ID-4296) was a United States Navy cargo ship in commission in 1919.

Watonwan was a steel-hulled, single-screw freighter built for the United States Shipping Board in 1918 at Bristol, Pennsylvania, by the Merchant Shipbuilding Corporation.

After loading 7,087 tons of flour, Watonwan departed Philadelphia on 19 February 1919, bound for the British Isles, and arrived in Falmouth, England, on 5 March 1919.

Reaching Genoa on 26 March 1919, she discharged the last of her cargo of flour there, loaded 1,250 tons of stone ballast, and sailed via Gibraltar for the United States.

She was simultaneously struck from the Navy List and returned to the Shipping Board.