Actor Colin Firth from the film "The King's Speech", arrives at the 17th annual Screen Actors Guild Awards in Los Angeles, California January 30, 2011.

LOS ANGELES, Jan. 30 (Xinhua) -- Colin Firth has won the U.S. Screen Actors Guild (SAG) Award for best actor for his portrayal of a British monarch who overcame nervous stammer to deliver a major speech in "The King's Speech" at a ceremony held at the Shrine Auditorium in Los Angeles on Sunday night.