The Tokai Maru was a Japanese passenger-cargo ship built by the Mitsubishi Heavy Industries shipyard that was sunk in Apra Harbor, Guam, in 1943, during World War II.

[3] On January 24, 1943, USS Flying Fish spotted Tokai Maru in Apra Harbor, Guam, a U.S. territory then occupied by Japan.

[3] Seven months later, in August 1943, USS Snapper spotted Tokai Maru and another vessel moored in the northeast corner of Apra Harbor.

She waited seven days for the Japanese ships to leave before sailing to the north of the harbor on August 27, 1943, and firing three torpedoes at the first target and one at the second.

One torpedo hit Tokai's port side #3 cargo hold, sinking her directly on top of the wreck of SMS Cormoran II, a World War I German merchant raider.