Kagamiō Hideoki (Japanese: 鏡桜 秀興, born 9 February 1988 as Batkhuu Nanjid (Mongolian: Батхүүгийн Нанжид)) is a Mongolian professional sumo wrestler from Ulaanbaatar. He made his debut in July 2003 for Kagamiyama stable. He reached the jūryō division in January 2013 and the top makuuchi division a year after that. His highest rank has been maegashira 9. Following a long-term injury layoff he fell off the banzuke or ranking sheets in 2021.