Goichi Oie (17 February 1897 – August 2, 1944) was a captain in the Imperial Japanese Navy during World War II, and died during the Battle of Tinian.

Goichi Oie was the subordinate to Admiral Kakuji Kakuta, the commander of the Tinian garrison.

Oie and Kiyochi Ogata, two of the Japanese commanders on the island, had their headquarters set up at Mt.

Kakuta, Ogata, and Oie committed suicide in the traditional fashion of seppuku, where they stabbed themselves with swords and disemboweled themselves.

The knife that Goichi Oie used to commit seppuku was retrieved by a US Marine named Fred Osgood and sent home to the US in 1944.