Lucien Lamoureux PC OC (French pronunciation: [lysjɛ̃ lamuʁø]; August 3, 1920 – July 16, 1998) was a Canadian politician and Speaker of the House of Commons of Canada from 1966 to 1974.

In 1963, he became Deputy Speaker of the House of Commons and decided to stop attending meetings of the Liberal caucus in order to maintain impartiality.

Lamoureux served as speaker during two minority governments, 1965–1968 and 1972–1974, experiences that required him to maintain authority and neutrality in a situation where no party had control of the House.

As the election produced a minority government for the Liberals who had only two more seats than the Conservatives, the closeness of it was perhaps the reason why the opposition parties would choose not to follow such a precedent.

In April 1974, Lamoureux became the longest serving Speaker in the history of the Canadian House of Commons, surpassing the record set by Rodolphe Lemieux.