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.