中国香港男演员。1958年出生于香港，1970年代加入亚洲电视，曾是亚视的一线小生，但是在加入无线后大多被派演一些无关轻重的闲角，现仍为无线电视旗下艺人。与卢惠光一起，被称为成龙的左右护法之一，曾跟随成龙15年，但最终反目成仇。参演过《警察故事III超级警察》、《重案组》、《飞虎雄师之极道战士》、《醉拳2》、《鼠胆龙威》、《霹雳火》、《千王之王2000》、《中华赌侠》和电视剧《国际刑警》等数十部影视作品。

William Duen Wai-lun, born 1958, was a one of the real life bodyguards of Jackie Chan along with Jackie Chan Stunt Team member Ken Lo, a role he performed from 1988 to 2003. He worked on many films with Jackie Chan and his stunt team and even did a few stunts himself. He was known more as a character actor than a stuntman, often playing police officials, including controversially in the movie High Risk (1995), which mocked Jackie Chan. In the movie Gorgeous (1999) he and fellow Jackie Chan bodyguard, Ken Lo, parody their real selves by playing bodyguards to the films antagonist L. W. Lo, played by Emil Chau.