Lee Dong-keun (Hangul: 이동근; Korean pronunciation: [i.doŋ.ɡɯn] or [i] [toŋ.ɡɯn]; born 20 November 1990) is a Korean badminton player specializing in men's singles. He won his first international senior title at the 2011 Vietnam International tournament. Lee participated at the 2012 World University Championships in Gwangju, South Korea, won a gold medal in the mixed team and a bronze in the singles events. He was also part of the South Korean winning team at the 2014 Asian Games. In 2016, Lee represented his country competing at the Summer Olympics in Rio de Janeiro, Brazil.