Yoo Yeon-jung (Korean: 유연정; born August 3, 1999), known mononymously as Yeonjung, is a South Korean singer signed under Starship Entertainment and Yuehua Entertainment. She is best known for being a member of the South Korean-Chinese girl group WJSN, and for finishing 11th in the survival show Produce 101, making her a member of I.O.I.