Lee Yong-dae (Hangul: ???; Hanja: ???; Korean pronunciation: [i.jo?.d??]; born 11 September 1988) is a professional badminton player from South Korea who had been successful in both men's and mixed doubles.
He reached world number 1 ranking with 4 different partners, Jung Jae-sung, Ko Sung-hyun and Yoo Yeon-seong in men's doubles, and Lee Hyo-jung in mixed doubles.
He won a total of 43 Superseries titles, 37 in the men's doubles, the most of any doubles player in one discipline, and 6 in mixed doubles.
He was ranked world number 1 in men's doubles for 117 consecutive weeks with his last partner, Yoo Yeon-seong.
After winning the 2016 Korean Superseries with Yoo, Lee announced his retirement from international badminton.
In 2018, he paired again with Kim Gi-jung, and won the titles of Spain Masters and Macau Open.