Rodolphe Lemieux PC FRSC (French pronunciation: [ʁɔdɔlf ləmjø]; November 1, 1866 – September 28, 1937) was a Canadian parliamentarian and long time Speaker of the House of Commons of Canada (1922–1930).

In the 1911 election, Lemieux engaged in a series of public debates before audiences of several thousands with nationalist leader Henri Bourassa who was threatening the Liberal's base in Quebec.

Lemieux was a sharp critic of the Conservative government of Robert Borden accusing it of putting the interests of the British Empire ahead of those of Canada.

When Mackenzie King led the Liberals back to power in the 1921 election, he chose Ernest Lapointe as his Quebec lieutenant rather than Lemieux.

He remained Speaker when Governor General Byng appointed Arthur Meighen as Prime Minister rather than call an election.

Lemieux presided over three successive Parliaments and was the longest serving Speaker until Lucien Lamoureux broke the record in 1974.