Kenneth Roy Williams (June 28, 1890 – January 22, 1959) was an American professional baseball player. He played as an outfielder in Major League Baseball from 1915 to 1929. Williams began his major league career with the Cincinnati Reds before spending the majority of his playing days with the St. Louis Browns, and ended his career playing for the Boston Red Sox. He batted left-handed and threw right-handed. In 1922, Williams became the first player in Major League Baseball history to hit 30 home runs and steal 30 bases in the same season.