Mont-Saint-Bruno--L'Acadie

Mont-Saint-Bruno--L'Acadie is a federal electoral district on the south shore of Montreal in the Montérégie region of Quebec. Created through the 2023 redistribution, the riding encompasses the suburban communities of Saint-Bruno-de-Montarville, Saint-Basile-le-Grand, Sainte-Julie, and Carignan. The 2025 contest was an open-seat race following the retirement of longtime Bloc Québécois MP Stéphane Bergeron, and the riding attracted a diverse slate of candidates vying to succeed him.

Candidates

Bienvenu-Olivier Ntumba (Liberal) -- Originally from the Democratic Republic of Congo, Ntumba studied business administration at HEC Montréal and has worked in the federal public service, the City of Montreal, the City of Laval, and the aerospace sector. A Liberal Party member since 2014 and a resident of the Saint-Hubert sector of Longueuil, he founded a non-profit organization dedicated to promoting women's rights. His election made him the first Canadian of Congolese origin elected as a federal MP and the first Black candidate to win in this riding.

Noémie Rouillard (Bloc Québécois) -- A lawyer in private practice specializing in family law and youth law, Rouillard holds a certificate in social and labour law from UQAM. She spent five years working in the office of Bloc Québécois parliamentary leader Alain Therrien before seeking the nomination to succeed Bergeron.

Nicolas Godin (Conservative) -- The Conservative standard-bearer in the riding, Godin sought to build on the party's national momentum in a traditionally Bloc-leaning area of the Montérégie.

Mirabelle Leins (NDP) -- The NDP candidate in the riding, Leins carried the party's banner in a contest dominated by the Liberal-Bloc rivalry on the south shore.

Maria Korpijaakko (Green Party) -- The Green Party candidate, Korpijaakko offered voters an environmentally focused alternative in this suburban riding.

Patrick Rochon (People's Party - PPC) -- Rochon represented the People's Party of Canada, advocating for the party's platform of smaller government and individual freedoms.

About the Riding

Mont-Saint-Bruno--L'Acadie sits in the heart of the suburban south shore, a rapidly growing corridor of communities that blend small-town character with proximity to Montreal. Saint-Bruno-de-Montarville is anchored by Mont Saint-Bruno, a popular destination for hiking and skiing, while Sainte-Julie and Saint-Basile-le-Grand are classic bedroom communities that have seen steady population growth over the past two decades. The addition of Carignan through redistribution brought a more rural flavour to the riding's western edge.

The riding had been held by the Bloc Québécois under Stéphane Bergeron, one of the party's founding members, since 2019. His decision not to seek re-election opened the door to a competitive race. The arrival of Mark Carney as Liberal leader shifted the dynamic across Quebec's south shore, and the Liberals successfully flipped the seat. Ntumba's victory represented part of a broader Liberal surge in Montérégie ridings that had long been Bloc strongholds.

Local issues in the 2025 campaign included housing affordability in these fast-growing suburbs, transportation links to Montreal, and the economic pressures facing young families who had moved to the south shore seeking more affordable housing options.