Old Partner (Korean: 워낭 소리; RR: Wonang Sori; lit. Cowbell Sound) is a 2008 South Korean documentary film directed by Lee Chung-ryoul. Set in the small rural town of Hanul-ri in Sangun-myeon, Bonghwa County, North Gyeongsang Province, the film focuses on the relationship between a 40-year-old cow and an old farmer in his 80s.

The film was a surprise success. It attracted over 2.93 million viewers, setting the record for the highest grossing independent film in Korean film history. It won the PIFF Mecenat Award at the Pusan International Film Festival and the Audience Award at the Korean Independent Film Awards. Lee Chung-ryoul became the first independent film director to receive the Best New Director award at the Baeksang Arts Awards.