Kasugaō Katsumasa (春日王 克昌, born 1 July 1977, as Kim Seong Taek) is a former sumo wrestler from Incheon, South Korea. He was the first sumo wrestler to reach the top makuuchi division officially representing South Korea. (Several other top wrestlers in the past have hid a Korean or half-Korean background). He joined sumo in 1998, making the top division for the first time in 2003. His highest rank was maegashira 3. In September 2009, he acquired Japanese citizenship. In April 2011 he was ordered to retire by the Japan Sumo Association after an investigation found him guilty of match-fixing.