Koki Uchiyama (内山 昂輝, Uchiyama Kōki, August 16, 1990) is a Japanese actor, voice actor (seiyū) and singer from Saitama Prefecture. He is affiliated with Himawari Theater Group. In 2011, he won Best Rookie Actor at the 5th Seiyū Awards, and in 2015, Best Voice Actor at the Tokyo Anime Awards.