Yu Hyun-mok (July 2, 1925 – June 28, 2009) was a South Korean film director. Born in Sariwon, Hwanghae, Korea (North Korea today), he made his film debut in 1956 with Gyocharo (Crossroads). According to the website koreanfilm.org, his 1961 film Obaltan "has repeatedly been voted the best Korean film of all time in local critics' polls." Yu attended the San Francisco International Film Festival in 1963, where Variety called Obaltan a "remarkable film", and praised Yu's "brilliantly detailed camera" and the film's "probing sympathy and rich characterizations."
His dedication to the intellectual side of film and interest in using film to deal with social and political issues led him to have difficulties both with box-office-oriented producers and with Korea's military government during the 1960s and 1970s. Korean critics have said his directing style is "in the tradition of the Italian Neorealists," yet "the terms 'modernist' or 'expressionistic' just as applicable to his works."
Besides his directing activities, he has taught film and made a significant contribution to Korean animation by producing Kim Cheong-gi's 1976 animated film, Robot Taekwon V. A retrospective of Yu's career was held at the 4th Pusan International Film Festival in 1999.
Yu died from a stroke on June 28, 2009.