George S. Barnes, A.S.C. (October 16, 1892 – May 30, 1953) was an American cinematographer from the era of silent films to the early 1950s. Over the course of his career, he was nominated for an Academy Award eight times, including his work on The Devil Dancer (1927) with Gilda Gray and Clive Brook. However, he only won once, for his work on the Alfred Hitchcock film Rebecca (1940). He died at the age of 60 in Los Angeles, California, after having worked on at least 142 films.

He was married to Joan Blondell from 1933 to 1936, and was the father of television executive Norman S. Powell.