Park Si-eun
- Born
- 1 August 2001 (25 years)
- Place of birth
- Seoul, South Korea
- Gender
- Female
Park Si-eun, known mononymously as Sieun, is a South Korean singer and actress under High Up Entertainment. She is a member of the girl group STAYC and a former member of the trainee team i-Teen. She made her acting debut in the children's television series Pluto Squad (2014).
