Harumafuji Kōhei, Mongolian sumo wrestler, the 70th Yokozuna
Harumafuji Kōhei (Japanese: 日馬富士 公平, born April 14, 1984 as Davaanyamyn Byambadorj (Mongolian: Даваанямын Бямбадорж)), previously known as Ama Kōhei (安馬 公平), is a Mongolian former professional sumo wrestler. He was the sport's 70th yokozuna from 2012 to 2017, making him the third Mongolian and fifth overall non-Japanese wrestler to attain sumo's highest rank.Harumafuji began his professional career in 2001 and reached the top makuuchi division in 2004. He won ten special prizes for his achievements in tournaments. In November 2008 he became the seventh foreign-born wrestler in sumo history to reach the second-highest rank of ōzeki. In May 2009, he won his first tournament championship. He went on to win a total of nine top division championships, three of them with a perfect record. At 133 kg (293 lb), Harumafuji was the lightest man in the top division as of September 2015. He is noted for his technical skill and his rivalry with fellow Mongolian yokozuna Hakuhō.

Harumafuji admitted to assaulting fellow Mongolian wrestler Takanoiwa during a regional sumo tour in late October 2017. He withdrew from the November 2017 honbasho shortly after the allegations surfaced. On November 29, 2017, his stablemaster, Isegahama, submitted Harumafuji's letter of resignation to the Japan Sumo Association.