USS Commodore (401B), also known as R.T.S. Commodore, was a landlocked "dummy" training ship of the United States Navy. Built to resemble a small escort ship, she was built at the United States Naval Training Center, Bainbridge in Maryland. She was equipped with operational guns and equipment, except for an engine, to allow for the training of sailors in shipboard operations in a reasonably safe environment during the Second World War and the early Cold War era. Commodore was dismantled when the base was closed in the 1970s.