Lee Yun-jeong (Hangul: 이윤정; born December 20, 1976) is a South Korean singer. She is known as a former member of the Korean band “Pippi Band” (Korean: 삐삐밴드), which debuted in 1995 before disbanding in 1998.

Yunjeong made her solo debut with her first album “進化” (Evolution), which was released in 1997. After releasing the album, Yunjeong went to study in Europe, causing a long hiatus before releasing her second album “六感” (Korean: 육감) (Sixth Sense) which had a totally different concept than the first album.

Yunjeong eventually married singer Lee Hyun-jun (Hangul: 이현준) and both are part of the duo EE.
Yunjeong is also part of the music project called “numnum” (Hangul: 넘넘).