Lee Won-geun (born June 27, 1991) is a South Korean actor. He made his acting debut in the 2012 historical television series Moon Embracing the Sun (2012) and is known for starring in the high school drama Cheer Up! (2015) and romantic-comedy One the Woman (2021), as well as the film Misbehavior (2017).
Lee mandatory military service on June 13, 2019, in the National Police Agency Compulsory Police Sugyeong Military Service and was discharged from the conscripted police on January 7, 2021.