Robert Patrick (born November 5, 1958) is an American actor.

He is best known for his roles as the T-1000 in the 1991 film Terminator 2: Judgment Day and Agent John Doggett in The X-Files from 2000 to 2002.

His other film roles include Fire in the Sky, Striptease, The Faculty, Spy Kids, Walk the Line and Flags of Our Fathers. His television appearances include Tales from the Crypt, The Real Adventures of Jonny Quest, The Sopranos, Stargate: Atlantis, Elvis, NCIS, Psych, Chuck, Sons of Anarchy and 1923.

He played Major John Skokes in the revival series episodes "Quality of Mercy" and "The Light Brigade". He was the first actor to play the same character in more than one episode of the series.