The Yamashio Maru class (Japanese: 山汐丸) consisted of a pair of auxiliary escort carriers operated by the Imperial Japanese Army during World War II.

In 1944, the Japanese Army, which had already converted two passenger liners into combined assault ship and aircraft carriers, decided to acquire its own escort carriers to provide aerial anti-submarine cover for troop convoys.

[1] The conversion was extremely simple, with a 107-metre (351 ft 1 in)-long flush flight deck added.

Defensive armament consisted of sixteen 25 mm anti-aircraft guns, with a depth charge projector forward.

[2] Yamashio Maru commissioned on 27 January 1945 and was sunk at Yokohama harbor by US aircraft on 17 February.