Clyde Donald Kaiser (born February 3, 1935) is an American former professional baseball player and a pitcher in Major League Baseball for the Chicago Cubs between 1955 and 1957. A high school phenom from Byng, Oklahoma, Kaiser was the first "Bonus Baby" signed by the Cub franchise. He threw and batted right-handed and was listed as 6 feet 5 inches (1.96 m) tall and 195 pounds (88 kg). Kaiser would be included in off-season trades to the Braves in December 1957 and the Detroit Tigers in October 1959, but he never returned to the major leagues. He retired from pro ball after the 1961 season.