Seo Yea-ji (Hangul: 서예지, born April 6, 1990) is a South Korean actress and model.

She debuted in cable channel tvN's sitcom "Potato Star 2013QR3". Following her debut, Seo served multiple performances that were all critically acclaimed. She was also praised from viewers as the 'New Thriller Queen' when she starred in OCN thriller mystery television series Save Me (2017).

On January 2020, Seo joined newly established entertainment agency Gold Medalist as one of the two senior actors under the organization alongisde Kim Soo-hyun. Seo's first venture with her new management company came with tvN and Netflix broadcast romance drama It's Okay to Not Be Okay (2020).

Her acting caught attention globally; The New York Times named the series one of "The Best International Shows of 2020" and described Seo's performance as "mesmerizing". She also experienced a substantial rise in popularity and attracted media attention in Korea and internationally following her performance as the anti-social author Ko Moon-young.