Terunofuji Haruo (born 29 November 1991 as Gantulga Gan-Erdene) is a sumo wrestler from Ulaanbaatar, Mongolia.
He entered sumo in January 2011, and took the second division juryo championship in his debut as a sekitori in September 2013.
He took the top makuuchi division championship in May 2015, only 25 tournaments after his professional debut, which is third behind the renowned Asashoryu and Takanohana's 23 tournaments.
This earned him promotion to sumo's second highest rank of ozeki.
He has been runner-up in four other tournaments, and has four special prizes for Fighting Spirit and Outstanding Performance.
He has suffered from knee injuries and having survived being kadoban or in danger of demotion from the rank of ozeki on three previous occasions he was finally demoted after the September 2017 tournament.