Ewen Bremner (born 23 January 1972) is a Scottish actor.

Bremner was born in Edinburgh, a son of two art teachers. He attended Davidsons Mains Primary School and Portobello high School. He originally wanted to be a circus clown, but was offered a chance in show-business by television director Richard D. Brooks.

Bremner is probably best known to British audiences for his portrayal of Spud in Danny Boyle's film adaptation of Irvine Welsh's Trainspotting, and Mullet, the wimpish street thug in Guy Ritchie's Snatch. In Trainspotting, Bremner played the childlike, likeable, gullible and seemingly doomed Spud to excellent reviews and in Snatch is probably best remembered for his memorable interrogation scene with Vinnie Jones.

In the 1995 stage version of Trainspotting Bremner played the lead role of Renton, the role played by Ewan McGregor in the film. In America he is probably best known for playing supporting roles in blockbusters such as Pearl Harbor and Black Haw