Michael Dorn (born December 9, 1952) is an American actor best known for his role as the Klingon character Worf in the Star Trek franchise, appearing in all seven seasons of the television series Star Trek: The Next Generation (1987–1994), and later reprising the role in seasons four through seven of Star Trek: Deep Space Nine (1995–1999) and season three of Star Trek: Picard (2023). Dorn has appeared more times as a regular cast member than any other Star Trek actor in the franchise's history, spanning five films and 284 television episodes.

Outside of the Star Trek franchise, Dorn has appeared in the television series CHiPs (1979–1982), and has had voice roles as Coldstone and Taurus in the animated series Gargoyles (1994–1997), Kalibak in the DC Animated Universe, I.M. Weasel in I Am Weasel (1997–2000), Lord Darkar in the Nickelodeon dub of Winx Club (2011), Castle (2009-2016) as a psychotherapist, Captain Mozar in Teenage Mutant Ninja Turtles (2015–2016) and Battle Beast in Invincible (2021—present).

Outside of shows and movies, he has had voice roles in several Star Trek-related games, as well as more obscure voice roles such as a major companion Marcus and the main antagonist Frank Horrigan of the action RPG game Fallout 2 (1998) and a Krogan character in Mass Effect 2 (2010), among many other similar roles.