2025 Arthabaska provincial by-election

2025 Arthabaska provincial by-election
← 2022 August 11, 2025 Next →
Riding of Arthabaska
Turnout	59.98% ( 14.12pp)
MNA before election; Vacant;	Elected MNA ; Alex Boissonneault; Parti Québécois

The 2025 Arthabaska provincial by-election was held on August 11, 2025.^[1] 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.^[2]

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.^[3] 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.

Quebec provincial by-election, August 11, 2025: Arthabaska Resignation of Eric Lefebvre
Preliminary results — Not yet official
Party	Candidate	Votes	%	±%
	Parti Québécois	Alex Boissonneault	17,327	46.37	+36.36
	Conservative	Éric Duhaime	13,081	35.01	+10.32
	Liberal	Chantale Marchand	3,481	9.32	+5.56
	Coalition Avenir Québec	Keven Brasseur	2,693	7.21	-44.54
	Québec solidaire	Pascale Fortin	548	1.47	-7.76
	Climat Québec	Trystan Martel	96	0.26	-0.31
	Union Nationale	Eric Simard	55	0.15	–
	Équipe Autonomiste	Louis Chandonnet	31	0.08	–
	Independent	Denis Gagné	29	0.08	–
	Independent	Arpad Nagy	24	0.06	–
Total valid votes			37,365	98.95
Total rejected ballots			398	1.05	-0.51
Turnout			37,763	59.98	-14.12
Eligible voters			62,960	–	+1.35
	Parti Québécois gain from Coalition Avenir Québec		Swing		+40.45

v t e 2022 Quebec general election: Arthabaska
Party	Candidate	Votes	%	±%
	Coalition Avenir Québec	Eric Lefebvre	23,447	51.75	-10.09
	Conservative	Tarek Henoud	11,187	24.69	+22.36
	Parti Québécois	Mario Beauchesne	4,538	10.02	+0.62
	Québec solidaire	Pascale Fortin	4,179	9.22	-3.35
	Liberal	Luciana Arantes	1,702	3.76	-7.60
	Climat Québec	Trystan Martel	256	0.57	–
Total valid votes			45,309	98.44	–
Total rejected ballots			720	1.56	-0.31
Turnout			46,029	74.10	+4.61
Electors on the lists			62,120	–	–
	Coalition Avenir Québec hold		Swing		-16.22

Candidates