William Joseph Klaus was an American professional baseball shortstop and third baseman, who played in Major League Baseball (MLB) with the Boston / Milwaukee Braves (1952–1953), Boston Red Sox (1955–1958), Baltimore Orioles (1959–1960), Washington Senators (1961), and Philadelphia Phillies (1962–1963). He played the end of the 1963 season playing for the Chunichi Dragons of Nippon Professional Baseball (NPB). Klaus batted left-handed and threw right-handed, and was listed as 5 feet 9 inches (1.75 m) tall and 160 pounds (73 kg), during his playing days.