A1 Type submarines were submarines of the Imperial Japanese Navy

Imperial Japanese Navy

The Imperial Japanese Navy was the navy of the Empire of Japan from 1869 until 1947, when it was dissolved following Japan's constitutional renunciation of the use of force as a means of settling international disputes...

 during World War II

World War II

World War II, or the Second World War , was a global conflict lasting from 1939 to 1945, involving most of the world's nations—including all of the great powers—eventually forming two opposing military alliances: the Allies and the Axis...

, equipped with an aircraft. The design was an adaptation of the J3 Type design, with the hangar opening forward of the conning tower.

Three boats were built, and equipped with communication facilities allowing them to operate as the command ships for groups of submarines.

• I-9 was sunk by destroyer USS Frazier
  USS Frazier (DD-607)
  USS Frazier was a Benson-class destroyer in the United States Navy during World War II. She was named for Daniel Frazier.Frazier was launched 17 March 1942 by Bethlehem Steel Corporation, San Francisco, California; sponsored by Mrs...
  
   in the Aleutians on 11 June 1943.
• I-10 was sunk by destroyer USS David W. Taylor
  USS David W. Taylor (DD-551)
  USS David W. Taylor , a Fletcher-class destroyer, was a ship of the United States Navy named for Rear Admiral David W. Taylor ....
  
   and destroyer escort USS Riddle
  USS Riddle (DE-185)
  USS Riddle was a built for the United States Navy during World War II. She served in the Pacific Ocean and provided escort service against submarine and air attack for Navy vessels and convoys...
  
   east of Saipan on 4 July 1944.
• I-11 disappeared off Ellice Island on 11 January 1944.