USS Density (AM-218) was an Admirable-class minesweeper built for the U.S. Navy during World War II. She was built to clear minefields in offshore waters, and served the Navy in the Pacific Ocean. She was launched 6 February 1944 by Tampa Shipbuilding Co., Inc., Tampa, Florida; sponsored by Miss M. Farmwald; and commissioned 15 June 1944, Lieutenant Commander R. R. Forrester, Jr., USNR, in command. She was reclassified MSF-218 on 7 February 1955. The vessel was later renamed MV Galaxy and was home to the British offshore pirate radio station Radio London.