Arthur John Ditmar (April 3, 1929 – June 11, 2021) was an American starting pitcher in Major League Baseball who played with the Philadelphia / Kansas City Athletics (1954–56, 1961–62) and the New York Yankees (1957–61). Ditmar batted and threw right-handed and was listed at 6 feet 2 inches (1.88 m) tall and 185 pounds (84 kg). Born in Winthrop, Massachusetts, Ditmar grew up in the Berkshire County city of Pittsfield, where he graduated from high school. Ditmar died on June 11, 2021, at the age of 92.