Roy Ellam (February 8, 1886 – October 28, 1948), nicknamed "Slippery", was a professional baseball player. He was a shortstop for parts of two seasons (1909, 1918) with the Cincinnati Reds and Pittsburgh Pirates. For his career, he compiled a .143 batting average, with one home run and six runs batted in.
He was born in Conshohocken, Pennsylvania.
He was killed on October 28, 1948 in Conshohocken when he was hit by a 150 lb (68 kg) weight which fell from a fire escape.