• United States Fourth Fleet
• IJN 4th Fleet
  IJN 4th Fleet
  The was a fleet designation of the Imperial Japanese Navy. The Fourth Fleet designation was used during three separate periods. The initial designation was for a group of ships that were assigned to work together during the Russo-Japanese conflict and the period of its immediate aftermath...
  
  , Imperial Japanese Navy
• Luftflotte 4
  Luftflotte 4
  Luftflotte 4 was one of the primary divisions of the German Luftwaffe in World War II. It was formed on March 18, 1939 from Luftwaffenkommando Österreich in Vienna. The Luftflotte was redesignated on April 21, 1945 to Luftwaffenkommando 4, and became subordinated to Luftflotte 6. It was the...
  
  

See also

• Fourth (disambiguation)
• Fleet (disambiguation)
• Third Fleet (disambiguation)
• Fifth Fleet (disambiguation)