Douglas Christopher Judge was born and raised in Los Angeles, and is of African-American and Cherokee ancestry.

Judge always knew that he wanted to be an actor, wanting to invoke feelings in others that he was receiving from the shows. He realized quickly that sports would be the stepping stone to an acting career.

Judge's largest role came in 1997 with Stargate SG-1 (1997). While at a friend's house, he saw his friend's roommate practicing for an audition and was intrigued. While the roommate was away, Judge looked at the audition notes, then called his agent and insisted he get him an audition, or lose him as a client. At the audition, there were three sets of actors for each of the principal roles, but eight or ten for the role of "Teal'c". Judge was confident he got the part when they dismissed everyone who read for the part, except him. Out of all the actors on "Stargate SG-1", Judge has been in the most episodes.

More recent works of Judge's include guest spots on Andromeda (2000) and Stargate: Atlantis (2004), the television movie Personal Effects (2005), and the films, Snow Dogs (2002) and A Dog's Breakfast (2007), the latter written and directed by fellow "Stargate" actor, David Hewlett.

Judge also does voice acting for animated series and video games, including the voice of "Magneto" on X-Men: Evolution (2000) and the canceled "Stargate SG-1: The Alliance". In the season eight episodes of "Stargate SG-1" (Avatar (2004) and "The Warrior"), Teal'c informs SG-1 that he plays Def Jam Vendetta (2003), alluding to the fact that Judge was a voice actor in that game. He is also known for voicing "Jericho" in Turok (2008).