Christian Lee (Chinese: 李胜龙, Korean: 이승용, born June 21, 1998) is a Canadian-born American mixed martial artist who competes in the featherweight, lightweight and welterweight divisions of ONE Championship.

[12] At the age of 17, Lee signed with ONE Championship and made his promotional debut at ONE: Spirit of Champions on December 11, 2015, earning his first career win with a 29-second TKO of David Meak.

[14] On March 18, 2016, he earned another first-round win against Anthony Engelen at ONE: Union of the Warriors with a TKO stoppage by punches and elbow in a catchweight bout.

[17] In his next match on August 13, 2016, Lee suffered his first professional defeat to rising featherweight Martin Nguyen at ONE Championship: Heroes of the World, losing in the first-round via a guillotine choke.

[19] For the first time in his career, Lee was pushed to three rounds before finally submitting Keanu Subba with an armbar at ONE Championship: Quest for Greatness on August 18, 2017.

[21] Lee submitted Kazunori Yokota in the second round at ONE Championship: Visions of Victory on March 9, 2018, to clinch his fourth straight win.

[22] After his strong run of performances, Lee would earn a title shot against ONE Featherweight World Champion Martin Nguyen at ONE Championship: Unstoppable Dreams on 18 May 2018.

[24] Lee dropped another match against Filipino Edward Kelly at ONE Championship: Beyond the Horizon on September 8, 2018, after he was disqualified under the promotion's global martial art ruleset.

He got back on the win sheet against former Pancrase Lightweight Champion Kazuki Tokudome in a 73 kg catchweight bout at ONE Championship: Heart of the Lion on 9 November 2018, defeating the Japanese fighter in the first-round via TKO.

[26] The match was added to the card on short notice after his sister Angela Lee, who was scheduled to face Xiong Jing Nan for the ONE Strawweight Championship, was forced to pull out due to a back injury.

[31] On May 17, 2019, at ONE Championship: Enter The Dragon, Lee survived an armbar submission attempt to upset the Japanese grappling legend in the second-round via TKO finish and win his first mixed martial arts world title.

[6] On September 26, 2019, ONE Championship Chairman and founder Chatri Sityodtong announced that Lee had accepted an offer to serve as a late-notice replacement for the injured Eddie Alvarez in the ONE Lightweight World Grand Prix Final.

The match would be against Turkish finalist Saygid Guseyn Arslanaliev at ONE: Century – Part 1 on 13 October 2019, after initial replacement Filipino fighter Eduard Folayang had trouble with visa issues.