USS Muskeget (AG-48/YAG-9) – later known as USCGC Muskeget (WAG-48) – was a commercial cargo ship acquired by the U.S. Navy during World War II. She was outfitted with a variety of guns and depth charge devices and sent on weather patrol in the North Atlantic Ocean. She disappeared with loss of all crew members; it was later determined she had been sunk by a German submarine.