Julian Dana William McMahon (born 27 July 1968) is an Australian-American actor and model, and the son of a former Prime Minister of Australia, Sir William McMahon.
McMahon won recognition for his roles in television dramas, in portrayals of Ben Lucini in the Australian soap opera Home and Away (1989–91), Detective John Grant in the American crime drama Profiler (1996-2000), Cole Turner in the American supernatural drama Charmed (2000–03), and Christian Troy in the American medical drama Nip/Tuck (2003–10). He also appeared in films with leading and supporting roles, such as Chasing Sleep (2000) alongside Jeff Daniels, Doctor Doom in the Fantastic Four franchise (2005 and 2007), Premonition (2007) starring alongside Sandra Bullock, Red (2010) alongside Bruce Willis, and Bait (2012) alongside Dan Wyllie and Xavier Samuel.
McMahon's work in television, particularly with Nip/Tuck and Charmed garnered him more success. The former series won an Emmy Award and a Golden Globe Award. McMahon played the lead role in Nip/Tuck, alongside Dylan Walsh throughout the entire series' run. He also played Jonah on Marvel's Runaways. He currently stars as Jess LaCroix on the CBS crime drama FBI: Most Wanted.