Metawin Opas-iamkajorn (born 21 February 1999 in Bangkok, Thailand), known professionally as Win Metawin, is a Thai actor, model, and entrepreneur. He rose to fame in 2020 with his breakout role as Tine in the hit series 2gether: The Series, and later gained further popularity portraying Kavin in F4 Thailand: Boys Over Flowers.

Metawin is also recognized as a fashion icon, having appeared on the covers of Vogue, Harper's Bazaar, Elle, and GQ. He became the first Thai brand ambassador for Prada and Tiffany & Co. and was named to Forbes Asia's 30 Under 30 list Class of 2023 and GQ Men of the Year 2024.

Beyond acting and modeling, he is an accomplished entrepreneur. He founded the street wear fashion brand VELENCE in 2020, and co-launched the dessert label SOURI with his sister, gaining attention for his influence in lifestyle and business.

Metawin took part in a high school exchange program in Iowa, USA, where he completed his GED in 11th grade. He later earned a degree in Economics (International Program) from Thammasat University.