Kotono Tanaka (田中 琴乃, Tanaka Kotono, born 18 August 1991) is a Japanese group rhythmic gymnast. Born in Beppu, she represents her nation at international competitions. She participated at the 2008 and 2012 Summer Olympics in London. She also competed at world championships, including at the 2007, 2009, 2010 and 2011 World Rhythmic Gymnastics Championships.