|Operator:||Imperial Japanese Army|
|Laid down:||19 July 1944|
|Launched:||14 November 1944|
|Commissioned:||27 January 1945|
|Fate:||Sank by US Aircraft 17 February 1945|
|Displacement:||11,800 t standard|
|Length:||148 m (516 ft 6 in)oa|
|Beam:||20.40 m (66 ft 11 in)|
|Draught:||9.00 m (29 ft 6 in)|
|Propulsion:||1-shaft Steam turbine, 4,500 shp|
|Range:||9,000 NM at 13 knots|
|Armament:||16 25 mm AA, 120 Depth Charges|
|Aircraft carried:||8 aircraft|
Yamashio Maru (山汐丸?) was a Japanese escort carrier of the Second World War converted from a merchant tanker for use by the Imperial Japanese Army. It was sunk by American aircraft before it could be operationally used as a carrier.
In 1944, the Japanese Army, had already converted two passenger liners into combined assault ship and aircraft carriers, when it decided to acquire its own escort carriers to provide air cover for Troop convoys. It therefore chartered two partly built Type 2TL Tankers, the Yamashio Maru (being built by Mitsubishi at Yokohama) and the Chigusa Maru, for conversion to basic auxiliary escort carriers.
The conversion was extremely simple, with a 107 m (410 ft) long flush flight deck added. There was no hangar, the ship's eight Ki-76s being stored on deck. Defensive armament consisted of sixteen 25 mm anti aircraft guns, with a depth charge projector forward.
Yamashio Maru commissioned on 27 January 1945, was sunk by US aircraft 21 days later, on 17 February 1945. Plans were drawn up for conversion to a coal burning freighter, but she was never used as a carrier. Her sister ships, Chigusa Maru and Zuiun Maru, were incomplete when Japan surrendered and served as Tankers postwar.
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- Gardiner, Robert and Chesneau, Roger (editors). Conway's All The World's Fighting Warships 1922–1946. London:Conway Maritime Press, 1980. ISBN 0-85177-146-7.
- Christian W. Beilstein (Author), Shizuo Fukui (Compiler). Japanese Naval Vessels at the End of World War II. US Naval Institute Press, 1992. ISBN 1-85367-125-8.