German submarine U-183 was a Type IXC/40 U-boat of the Nazi German Kriegsmarine built during World War II. She was commissioned in April 1942, one of the first IXC/40 boats, somewhat larger and faster than the IXC type. She began her service life in the 4th U-boat Flotilla, a training organization, moving on to the 2nd, then the 33rd Flotilla, both operational or front outfits. U-183 was in the first wave of "Monsun boats" or Monsun Gruppe, which operated in the Indian Ocean from Japanese bases in the occupied Dutch East Indies and British Malaya, mostly Penang.