Lee Jun Ki (Hangul: 이준기, Hanja: 李準基, lahir di Busan, Korea Selatan, 17 April 1982; umur 28 tahun) adalah aktor dan model berkebangsaan Korea Selatan. Dia mulai berkarier di dunia film sejak akhir-akhir 2000-an, dan dia dikenal dengan peran-perannya dalam serial film dan televisi: sebagai "Gong-gil" dalam The King and the Clown, sebagai "Seo Jung Woo" dalam My Girl, sebagai "Go Seung-suk" dalam Fly, Daddy, Fly, sebagai "Min" dalam Virgin Snow, dan sebagai "Lee Su Hyun" dalam Time of the Dog and Wolf.
Lee Jun Ki started out as a model and held minor roles in Korean dramas. In 2001, he first appeared in the television commercial for the So Basic fashion label. He first debuted in the movie 'The Hotel Venus' (Japanese Production). His first drama appearance was in 'Star's Echo', a two part mini drama series by MBC and Fuji TV in 2004. After this, he appeared in 'Nonstop 4', 'Drama City: What Should I Do?' and the movie 'Flying Boys'.
In 2005, his first major acting role came in the movie 'The King and the Clown' as the role of Gong Gil. Lee's acting skills had shone through his ability to present the characteristics of a homosexual clown, which pushed him to stardom and popularity throughout Asia, where he received many awards. His next role was to play the supporting character, Seo Jung Woo, in the 2005 hit drama 'My Girl'. It was from this drama that he had changed his image, from a homosexual clown to a wealthy play boy. Due to these roles, Lee's popularity sparked, allowing him to become not only well-known in Korea but also throughout Asia and overseas. Other movies and dramas he has completed are 'Virgin Snow', 'May 18', 'Time Between Dog and Wolf' and his successful drama 'Iljimae', in 2008.
Lee released his second album entitled 'J Style' on April 21, 2009. The album consists of eight songs; his three previous songs from his Episode I fan meeting plus his 5 new songs. Lee also played the role of a modern hero in a new drama called 'Hero' in late November of 2009.