Lee Eun-ju (Hangul: 이은주, Hanja: 李恩宙; born March 5, 1999) is a South Korean artistic gymnast who represents her nation at international competitions. She won the bronze medal in the team event at the 2015 Asian Artistic Gymnastics Championships. She competed at the 2016 Gymnastics Olympic Test Event and was chosen to represent her country at the 2016 Summer Olympics after their initial choice, Lee Go-im, was injured in training. Lee placed 53 in the all-around qualification, her best result being a 13.500 on the uneven bars.