USS Mona Island (ARG-9) was Luzon-class internal combustion engine repair ship in service with the United States Navy from 1944 to 1947.

Following shakedown in Chesapeake Bay, USS Mona Island departed Norfolk, Virginia, 2 December en route to the Pacific.

Six days out of Pearl Harbor, on 18 January 1945, she effected the rescue of survivors of a crashed Army C 47 transport, en route to Hawaii from the mainland.

Ten days later she got underway, towed by the tug Cahuilla (ATF-152), for Guam where temporary repairs to her rudder and screw enabled her to steam, independently, to San Diego, California, 19 November to 11 December.

She was transferred in 1962 to the Maritime Administration for lay up in the National Defense Reserve Fleet, James River, Fort Eustis, Virginia.