Ha Joon-won (; born 1976) is a South Korean film director and screenwriter. He co-wrote Bong Joon-ho's The Host (2006) and wrote and directed Dead Man (2024).
Ha Joon-won was born in 1976, He is the second son of filmmaker and actor Hah Myung-joong and film producer Park Kyung-ae. His elder brother, , is an actor. Ha began his career as a child actor in 1983, appearing in his father's film X. The family later collaborated on the 2007 film ', with Myung-joong directing and Joon-won producing.
Ha, who has 22 film credits as of 2025, is best known for co-scripting Bong Joon-ho's 2006 monster film The Host, and his feature directorial debut Dead Man (2024).