Ōuchiyama Heikichi (born Heikichi Ōuchi, 19 June 1926 – 1 November 1985) was a sumo wrestler from Hitachinaka, Ibaraki, Japan. He made his professional debut in 1944, and reached the top makuuchi division in 1949. He reached the second highest rank of ōzeki in 1955, and was a runner-up in two tournaments. He was well known for his extraordinary size – at 2.02 m (6 ft 7+1⁄2 in) tall he was the tallest modern era ōzeki until Akebono in 1992. After his retirement in 1959 he worked as a coach at Tokitsukaze stable and Tatsutagawa stable until his death in 1985.