Lee Seo-jin (born January 30, 1971) is a South Korean actor. He is best known for his leading roles in the historical dramas Damo (2003) and Yi San (2007).
Lee Seo-jin made his acting debut in 1999 in the television series House Above the Waves. After several supporting roles on TV, he rose to fame in the 2003 hit period drama Damo, followed by the also popular contemporary drama Phoenix in 2004. He then landed his first big screen leading role in the 2005 action blockbuster Shadowless Sword.