2025 Arthabaska provincial by-election
August 11, 2025
| |||||||||||||||||||||||||||||||||||||||||||||||
Riding of Arthabaska | |||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Turnout | 59.98% ( 14.12pp) | ||||||||||||||||||||||||||||||||||||||||||||||
| |||||||||||||||||||||||||||||||||||||||||||||||
| |||||||||||||||||||||||||||||||||||||||||||||||
The 2025 Arthabaska provincial by-election was held on August 11, 2025. The seat was represented by Eric Lefebvre of the CAQ until he resigned on 18 March 2025 to run for the partially-overlapping federal riding of Richmond—Arthabaska in the 2025 Canadian federal election.
In an attempt to win a seat in the National Assembly, Conservative Party of Quebec leader Éric Duhaime ran as a candidate in the by-election; he finished second behind the Parti Québécois' Alex Boissonneault. It was a recent stronghold for the Coalition Avenir Québec before Boissonneault became the first member of the Parti Québécois to be elected in the riding since 1998.