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, and died there at the age of 62.