Brian Denis Cox (born June 1, 1946) is a Scottish actor. A classically trained Shakespearean actor, he is known for his work on stage and screen. His numerous accolades include two Laurence Olivier Awards, a Primetime Emmy Award, and a Golden Globe Award, as well as a nomination for a British Academy Television Award. In 2003, he was appointed to the Order of the British Empire at the rank of Commander.

Cox trained at the Dundee Repertory Theatre before becoming a founding member of the Royal Lyceum Theatre. He went on to train as a Shakespearean actor, starring in numerous productions with the Royal National Theatre and the Royal Shakespeare Company, where he gained recognition for his portrayal of King Lear. Cox received two Laurence Olivier Awards for Best Actor for his roles in Rat in the Skull (1984), for Royal Court, and Titus Andronicus (1988). He received two more Olivier Award nominations for Misalliance (1986) and Fashion (1988).