Lieutenant William John Gillespie was a World War I flying ace credited with five aerial victories. Gillespie was a student at Daysland, Alberta before joining the military. He was posted to 41 Squadron on 11 December 1917. He scored five victories between 25 March and 7 July 1918; all of them were of the "driven down out of control" type. On 18 August 1918, he was hospitalized with influenza and sat out the duration of the war.