Lee Su-hyun (Korean: 이수현; born May 4, 1999), is a South Korean singer. Following her appearance on the SBS audition program K-pop Star 2 alongside her brother Lee Chan-hyuk, she debuted as the vocalist of the sibling duo AKMU on April 7, 2014, under YG Entertainment after winning the show. She was also part of the duo Hi Suhyun - formed in 2014 with Lee Hi. She debuted as a solo artist on October 16, 2020, with the digital single "Alien".

On television, she has appeared as a series regular on reality music programs including Begin Again as well as a judge on the audition program Superband. Lee also became a YouTuber through her channel, Leesuhyun, and a radio DJ for a KBS Cool FM show, AKMU Suhyun's Volume Up, where she received her first award at the 16th KBS Entertainment Awards for "Radio DJ Award". She has also sung original soundtracks for Korean television dramas including It's Okay to Not Be Okay, and the Disney live-action film Mulan.