Douglas Ross, M.D. is a fictional character from the NBC medical drama series ER, portrayed by American actor George Clooney. He is a pediatric fellow, employed by the pediatric service, but works in the ER. He is later promoted to a pediatric attending in the ER. He appears from the pilot episode before departing in the fifth season episode "The Storm - Part II". Clooney later made guest appearances in the sixth season episode "Such Sweet Sorrow" and in the fifteenth season episode "Old Times".

ER is an American medical drama television series created by Michael Crichton that aired on NBC from September 19, 1994, to April 2, 2009, with a total of 331 episodes spanning 15 seasons. It was produced by Constant c Productions and Amblin Television, in association with Warner Bros. Television. ER follows the inner life of the emergency room (ER) of Cook County General Hospital in Chicago, and various critical issues faced by the department's physicians and staff.