Sir Allen Bristol Aylesworth, PC, KCMG, QC (27 November 1854 – 13 February 1952) was a Canadian lawyer and parliamentarian.

Born in Newburgh, Canada West, of United Empire Loyalist ancestry, Aylesworth was educated at the University of Toronto, and called to the Ontario Bar in 1878.

As the Canadian member of the Alaska Boundary Tribunal in 1903, he presented his country's views in a minority report.

[1] He acted as British representative at the North Atlantic Fisheries Arbitration in The Hague, 1910–1911, and was knighted for his services.

A Liberal, Aylesworth was elected to the House of Commons of Canada in a by-election on 22 November 1905 and re-elected in the 1908 as the Member of Parliament for the riding of York North in the province of Ontario.