Yoo Yeon-jung (Korean: 유연정／兪璉靜, born August 30, 1999), also known as Yoon-jeong, is a South Korean female singer. She participated in the girl group survival show 'PRODUCE 101' in 2016 and ranked 11th, debuting as a member of I.O.I. She is currently the main vocalist of the girl group Cosmic Girl under STARSHIP Entertainment.
