Yoshino Maru (Kanji:吉野丸) was an 8,950-ton Japanese troop transport and hospital ship during World War II, which sank on 31 July 1944 with great loss of life.

In 1919, she was taken over by the United Kingdom, who transferred her as a war reparation in 1922 to the Japanese government, where she was renamed Yoshino Maru.

At the start of the Second Sino-Japanese War, she was chartered, later requisitioned, as a transport ship by the Imperial Japanese Navy.

On 26 January 1944 40 nm north of Rabaul, she was bombed and suffered a near-miss by an American patrol aircraft at 03-45S 151-42E.

on 21 April 1944 Japan's Ministry of Foreign Affairs submitted a protest to the United States about the bombing of the hospital ship.