Alexander Thomson Burr (November 1, 1893 – October 12, 1918) was an American professional baseball player who appeared in one inning of one game for the 1914 New York Yankees and was later killed in a military aviation training accident while serving with the U.S. Army Air Service in France during World War I.

He self-financed his trip to France where he volunteered as an ambulance driver before joining the aviation corps.

[1] He was killed shortly before the war ended in an airplane accident on October 12, 1918, while serving in the United States Army Air Service in Cazaux, France.

After colliding with a fellow pilot, Burr's plane crashed into a lake in flames; his body was recovered after 12 days.

[6] Burr was one of eight Major League Baseball players known either to have been killed or died from illness while serving in the armed forces during World War I.