The Kamikawa Maru-class cargo ship was a type of cargo ship of Japan, serving during the 1930s and World War II. Four of the five ships of the class were converted to seaplane tenders during the war.
The Ryoyo Maru was a 5,974-gross register ton passenger ship that was built by Kawasaki Dockyard Company, Kobe, for Tōyō Kisen Kabushiki Kaisha, launched in 1931. She was requisitioned by the Imperial Japanese Army and fitted out as a fast troop transport.
The Nichiryu Maru was a 5,447 gross register ton cargo ship built by Asano Ship Building Company, Tsurumi in 1919 as Rozan Maru. She was the third ship of the Yoshida Maru No 1-class of 25 standard cargo ships built by Asano Shipyard between 1918 and 1919. In April 1929, she was acquired by Karafuto Kisen Kabushiki Kaisha and in 1931, renamed Karafuto Maru. On 22 November 1937, she was acquired by Nissan Kissen Kabushiki Kaisha and renamed Nichiryu Maru. She was requisitioned by the Imperial Japanese Army during World War II.
The SS Yoshida Maru No. 1 was a Japanese cargo ship owned by Yamashita Kisen K. K. The ship was built in 1919 by Asano Shipbuilding Company, at Tsurumi-ku, Yokohama, and sank on 26 April 1944 with great loss of life.
Sakito Maru was a 7,126-ton Japanese merchant cruiser and troop transport that operated during World War II. She was sunk on 1 March 1944 with great loss of life.
Banshu Maru No. 52 was an auxiliary minesweeper of the Imperial Japanese Navy during World War II.
Hakuyo Maru was a Ministry of Agriculture and Forestry fisheries inspection and observation ship that was requisitioned by the Imperial Japanese Navy during World War II for service primarily as an auxiliary survey vessel but later as a submarine chaser, cargo ship, and patrol boat.
Hakuyo Maru was an auxiliary submarine chaser of the Imperial Japanese Navy during World War II.
Hakuyo Maru was a Japanese cargo ship of during World War II.
Hakuyo Maru was a Japanese transport ship of during World War II.
Shinyō Maru No. 3 or Sinyo Maru No. 3 was an American-built Japanese cargo ship during World War II.
Shunsen Maru was a steel-hulled steamer that was converted into an auxiliary net layer by the Imperial Japanese Navy during World War II.
Tenryo Maru was a requisitioned Imperial Japanese Army cargo/transport ship during World War II.
Sanuki Maru (Japanese:讃岐丸) was a 1939-built cargo ship, requisitioned as a seaplane tender by the Imperial Japanese Navy during World War II.
Kumagawa Maru (jp:球磨川丸) was a transport of the Imperial Japanese Navy during World War II.
Nichiai Maru (Japanese:日愛丸) was a transport of the Imperial Japanese Army during World War II.
Buyo Maru (Japanese:武洋丸) was a transport and hellship of the Imperial Japanese Army during World War II.
Shonan Maru No. 17 was a Japanese fishing vessel that was requisitioned by the Imperial Japanese Navy during World War II and converted into an auxiliary subchaser.
Sōya (宗谷) is a Japanese icebreaker that serves as a museum ship in Tokyo after a long and storied service spanning some of the 20th century's historic events. It is named for Sōya Subprefecture in Hokkaido.
Shonan Maru No. 7 was a Japanese whaling ship that was requisitioned by the Imperial Japanese Navy during World War II and converted into an auxiliary subchaser.
Empire of Japan 
