Air Marshal William Avery "Billy" Bishop VC, CB, DSO & Bar, MC, DFC, ED (8 February 1894 – 11 September 1956) was a Canadian flying ace and Victoria Cross recipient of the First World War. He was officially credited with 72 victories, making him the top Canadian ace of the war. During the Second World War, Bishop was instrumental in setting up and promoting the British Commonwealth Air Training Plan.
Bishop was born in Owen Sound, Ontario. He was the second of three children born to William A. and Margaret Bishop. His father, a lawyer and graduate of Osgoode Hall Law School in Toronto, was the Registrar of Grey County. Attending Owen Sound Collegiate and Vocational Institute, Bishop earned the reputation of a fighter, defending himself and others easily against bullies. He avoided team sports, preferring solitary pursuits such as swimming, horse riding, and shooting. Bishop was less successful at his studies; he would abandon any subject he could not easily master, and was often absent from class.