William Walker Cooper was an American professional baseball catcher and manager. He played in Major League Baseball as a catcher from 1940 to 1957, most notably as a member of the St. Louis Cardinals with whom he won two World Series championships. An eight-time All-Star, Cooper was known as one of the top catchers in baseball during the 1940s and early 1950s. His elder brother Mort Cooper, also played in Major League Baseball as a pitcher.