Morris Benton Thacker (May 21, 1934 – November 13, 1997) was an American professional baseball player. A catcher, Thacker's pro career extended for 13 seasons and included the entire 1962 campaign and parts of four others in Major League Baseball for the Chicago Cubs (1958; 1960–62) and St. Louis Cardinals (1963). He threw and batted right-handed, stood 6 feet 3 inches (1.91 m) tall and weighed 205 pounds (93 kg).