Benjamin Franklin Callahan (May 19, 1957 – January 9, 2007) was a Major League Baseball pitcher. The right-hander was drafted by the New York Yankees in the 31st round of the 1980 amateur draft, then traded to the Oakland Athletics on June 15, 1983. One week later he made his major league debut with the A's.
Out of the four games he pitched for Oakland (two starts), Callahan's second outing was his best. On June 27, 1983 he pitched six innings and gave up just one earned run in a 7-1 victory over the Kansas City Royals. This took place in front of 21,841 fans at the Oakland–Alameda County Coliseum. The losing pitcher was Larry Gura.
