Captain William Leeming Harrison MC was a Canadian fighter ace in the First World War.
William Leeming Harrison enlisted in the 220th Battalion (12th Regiment York Rangers), CEF of the Canadian Expeditionary Force on 3 April 1916 in his home town of Toronto.
The military doctor noted the younger Harrison's age as 18 years 3 months, his appearance as fair, with brown eyes and dark hair.
The squadron re-equipped with new Royal Aircraft Factory SE.5as, and Harrison used his new craft for his second victory, when he destroyed a Deutsche Flugzeug-Werke reconnaissance plane on 18 January 1918.
He always showed a splendid spirit of dash, keenness and tenacity, coupled with determination and skill in attacking enemy aircraft.