|Laid down:||1 May 1937|
|Launched:||16 May 1938|
|Commissioned:||25 February 1939|
|Fate:||Sunk 2 May 1942|
|Class & type:||Mizuho|
|Displacement:||10,930 tons standard|
|Length:||183.6 meters (602 ft 4 in) (waterline)|
|Propulsion:||2-shaft diesel engines, 15,200 bhp (11.3 mW)|
|Armament:||6 (3 x 2) 14cm (5.5-inch)/50-caliber guns, 12 x 25mm anti-aircraft guns|
|Aircraft carried:||24 seaplanes|
Mizuho was built to a similar design as the seaplane carrier Chitose, but with slightly less powerful diesel engines instead of Chitose's turbines. She carried 24 seaplanes, and was equipped to carry twelve miniature submarines, although she could not carry full loads of both at one time.
Mizuho participated in invasion support for much of her career; her first mission was with the Fourth Surprise Attack Force. On 1 March 1942, planes from Mizuho and Chitose damaged the American destroyer USS Pope (DD-225), which was later sunk by aircraft from the aircraft carrier Ryujo and gunfire from the heavy cruisers Ashigara and Myoko.
The American submarine USS Drum (SS-228) torpedoed Mizuho at 23:03 hours on 1 May 1942 40 nautical miles (74 km) off Omaezaki, Japan. She capsized and sank at 04:16 hours on 2 May 1942 with the loss of 101 lives. There were 472 survivors, of which 31 were wounded.
- ^ a b c d Toppan, Andrew (Jun 25, 1998). "World Aircraft Carriers List: Japanese Seaplane Ships". http://www.hazegray.org/navhist/carriers/ijn_sea.htm. Retrieved 2009-07-04.
- ^ a b Budge, Kent. "Mizuho, Japanese Seaplane Carrier". The Pacific War Online Encyclopedia. http://pwencycl.kgbudge.com/M/i/Mizuho_class.htm. Retrieved 2009-07-04.
- ^ a b c "IJN Mizuho Seaplane Carrier". http://www.globalsecurity.org/military/world/japan/mizuho-av.htm. Retrieved 2009-07-04.
- ^ Tully, Anthony. "IJN Mizuho: Tabular Record of Movement". http://www.combinedfleet.com/mizuho.htm. Retrieved 2009-07-04.
- ^ "USS Drum". http://www.steelnavy.com/DrumTour.htm. Retrieved 2009-07-04.
- ^ combinedfleet.com IJN Mizuho Tabular Record of Movement