A provincial by-election was held in Quebec on 24 September 2007 to fill the vacancy in the National Assembly riding of Charlevoix. The by-election was caused by the decision of PQ MNA Rosaire Bertrand to stand down to offer the new Parti Québécois leader Pauline Marois a way to become an MNA. The Liberal Party of Quebec stated that it would not stand a candidate against Marois so that all three party leaders would be represented in the National Assembly, but the Action démocratique du Québec did run a candidate. The ADQ accused the Liberals and the PQ of a lack of democratic principles, claiming that it was not necessary for a third-party leader to be represented in the National Assembly.

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