Yoon
- Born
- 14 April 2004 (22 years)
- Place of birth
- Gwangju, South Korea
- Gender
- Female
Shim Ja-yun (심자윤), known under her stage name Yoon (윤), is a South Korean singer/K-pop idol. She is under High Up Entertainment. She is best known as one of the lead vocalists of the girl group STAYC.
