Robert James Day (September 25, 1900 – February 7, 1985) was an American cartoonist and book illustrator. Day studied at the Otis Art Institute in Los Angeles between 1919 and 1927, while also on staff at the Los Angeles Times. Day was a long-time contributor to The New Yorker, with his work appearing from September 1931 to May 24, 1976, including eight covers. According to Kirkus Reviews, he specialized in satirizing "[the] so-called athletic pursuits, [and also] the foibles of war and peace." His All Out for the Sack Race (Random House, 1945) collected many of his New Yorker cartoons.