Aratama Maru (Kanji:新玉丸) was a merchant ship of the Empire of Japan.

Launched in 1938, she was pressed into service as a munitions transport in World War II.

She was struck by a torpedo fired from USS Seahorse on April 8, 1944, while approaching Guam as part of a Japanese ammunition resupply convoy.

After drifting for three days, the abandoned hull came to rest just inside the reef fringing Talofofo Bay on Guam's southeastern coast.

It has also been the subject of souvenir diving, and its position and condition have been affected by several typhoons.