Douglas Eugene Gallagher (February 21, 1940 – December 17, 2017) was an American professional baseball player and left-handed pitcher who appeared in nine games for the Detroit Tigers in 1962. Born in Fremont, Ohio, he batted right-handed and was listed as 6 feet 3 inches (1.91 m) tall and 195 pounds (88 kg). One highlight of Gallagher's MLB career came on April 27, 1962, when he pitched the final three innings against the Los Angeles Angels to preserve a 13–4 Tigers' victory for future Baseball Hall of Famer Jim Bunning and pick up his lone big-league save.