William Allen Walsh (20 August 1887 – 18 October 1940) was a Conservative member of the House of Commons of Canada.
He was born in Kingston, Ontario and became a school principal, school superintendent and teacher, primarily at the Protestant Strathcona Academy in the Montreal suburb of Outremont.
After serving one term, the 18th Canadian Parliament, Walsh entered the March 1940 election under the Conservative-based National Government party banner but was defeated by Fred Whitman of the Liberal party.
Walsh remains the last member of the House of Commons of Canada to represent the Mount Royal riding who was not a Liberal.
This article about a Quebec Member of Parliament from the Conservative Party of Canada (1867–1942) is a stub.