HMS Viking
Two ships of the Royal Navy have been named HMS Viking, after the Vikings, whilst another Viking was in service with the Royal New Zealand Navy:

  was a  launched in 1909 and sold for scrap in 1919. She was the only six-funnelled vessel to serve in the Royal Navy. was a V-class submarine launched in 1943. She was transferred to the Royal Norwegian Navy in 1946 and renamed . She was sold in 1964. See also
  was a motor gun boat launched in 1943 and sunk in a collision in 1945. She was originally ordered for the Turkish Navy but was taken over by the Royal Navy due to World War II. was a training ketch, known to have been in service with the Royal New Zealand Navy between 1937 and 1945.
  was a Royal Navy seaplane carrier of the First World War. She had been built in 1905 by Armstrong Whitworth as Viking,  a fast passenger ferry for the Isle of Man Steam Packet. Viking (disambiguation)#Ships

Royal Navy ship names