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Ōta Tenjinyama Kofun (太田天神山古墳) is a Kofun period burial mound located in the Uchigashimacho neighborhood of the city of Ōta, Gunma Prefecture in the northern Kantō region of Japan. It was designated a National Historic Site of Japan in 1941. It is the largest kofun in Gunma Prefecture and the 28th largest in the country. It is the only kofun with a length in excess of 200 meters in eastern Japan.. It is also sometimes referred to as the Dantaiyama Kofun (男体山古墳).