Terrebonne in the 2025 Canadian federal election

This article is about the electoral district in the 2025 Canadian Federal Election. For the by-election held in the provincial electoral district of Terrebonne in 2025, see 2025 Terrebonne provincial by-election.

As part of the 2025 Canadian federal election on April 28, 2025, an election took place for the federal electoral district of Terrebonne, Quebec. This election was a close contest between the incumbent Bloc Québécois candidate, Nathalie Sinclair-Desgagné, and the Liberal candidate Tatiana Auguste. This election became known for its narrow margin of victory and disputes over its result, with the seat changing hands three times over the preliminary count, validation process, and judicial recount.

Terrebonne in the 2025 Canadian federal election

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Riding of Terrebonne
Registered	89,725
Turnout	61,118 (68.12%)
First party Second party Third party   Lib BQ Con Candidate Tatiana Auguste Nathalie Sinclair-Desgagné Adrienne Charles Party Liberal Bloc Québécois Conservative Popular vote 23,352 23,351 10,961 Percentage 38.74% 38.74% 18.18% Swing 9.37pp 2.66pp 7.72pp
MP before election Nathalie Sinclair-Desgagné Bloc Québécois Elected MP Tatiana Auguste Liberal

In a preliminary count, Auguste was originally assumed to be the winner by 35 votes, but on May 1, the validation of election night results declared Sinclair-Desgagné as the winner by 44 votes. The narrowness of this margin triggered an automatic judicial recount overseen by the Superior Court of Quebec.^[1][2] On May 10, the recount added 74 votes, with 56 of them going to Auguste and 11 to Sinclair-Desgagné. After this recount, the result was reversed, with Auguste certified as the victor by one vote. The shift moved the Liberal seat count to 170, two short of a majority government.^[2]

The results became controversial after a would-be Bloc voter disclosed on May 13 that her mail-in ballot was rejected and returned to her due to a postal code misprint on the envelope provided by Elections Canada.^[3] On May 14, Elections Canada noted the error but stated that it did not have legal standing to overturn the judicial recount. The following day, the Bloc announced that it would challenge the result in the Superior Court and seek a by-election. The same day, Elections Canada stated that five other mail ballots with the incorrect returning address printed had been rejected for having arrived at the Elections Canada office after the deadline; the statement said that they could not determine if the incorrect address had led to the fatal delay.^[4] The application was filed in court on May 23,^[5] and the hearing will take place in October.^[6]

This is not the first time that Terrebonne has witnessed an unusual electoral result. In 1841, during the election for the 1st Parliament of the Province of Canada, Louis-Hippolyte LaFontaine was forced to withdraw because of intimidation by supporters of his opponent Michael McCulloch, thus allowing McCulloch to be elected by acclamation. LaFontaine would enter the Legislative Assembly in a later by-election elsewhere.^[7] In the 1935 provincial election, the election of Athanase David was contested on the ground that the ballot papers were not printed in the form prescribed under the Election Act. At the subsequent hearing, the judge ruled that all cast ballots were thus void. Immediately afterwards, the returning officer announced that, as this resulted in a 0–0 tie, he cast his deciding vote in favour of David.^[8][9] The returning officer's action was considered to have been without precedent anywhere in the world in countries with parliamentary-style legislatures.^[10] The Conservatives lodged an appeal,^[10] but the result was upheld by the Quebec Court of Appeal in April 1936.^[11] David would become the only member of the Assembly in Quebec history to be elected on only one cast vote.^[12][13]

Result

v t e 2025 Canadian federal election: Terrebonne
Party	Candidate	Votes	%	±%	Expenditures
	Liberal	Tatiana Auguste	23,352	38.741	+9.37
	Bloc Québécois	Nathalie Sinclair-Desgagné	23,351	38.739	−2.66
	Conservative	Adrienne Charles	10,961	18.18	+7.72
	New Democratic	Maxime Beaudoin	1,556	2.58	−4.07
	Green	Benjamin Rankin	630	1.05	−0.38
	People's	Maria Cantore	428	0.71	−1.97
Total valid votes/expense limit			60,278	98.63
Total rejected ballots			840	1.37
Turnout			61,118	68.12
Eligible voters			89,725
	Liberal notional gain from Bloc Québécois		Swing		+6.02
Source: Elections Canada[14][15]
Notes: This riding's results were subject to an automatic judicial recount on May 7, 2025.[16] Number of eligible voters does not include election day registrations.

Previous result

2021 transposed result

2021 federal election redistributed results[17]
Party		Vote	%
	Bloc Québécois	23,298	41.40
	Liberal	16,528	29.37
	Conservative	5,886	10.46
	New Democratic	3,742	6.65
	People's	1,506	2.68
	Green	802	1.43
	Others	4,518	8.03

2021 actual result

v t e 2021 Canadian federal election: Terrebonne
Party	Candidate	Votes	%	±%	Expenditures
	Bloc Québécois	Nathalie Sinclair-Desgagné	24,270	41.2	-9.4	$28,625.35
	Liberal	Eric Forget	17,475	29.6	+0.3	$6,336.80
	Conservative	Frédérick Desjardins	6,183	10.5	+2.9	$8,029.08
	New Democratic	Luke Mayba	3,913	6.6	-0.9	$7,745.37
	Independent	Michel Boudrias	3,864	6.6	N/A	$16,574.97
	People's	Louis Stinziani	1,594	2.7	+2.0	$0.00
	Green	Dave Hamelin-Schuilenburg	847	2.4	-2.3	$103.94
	Free	Nathan Fortin-Dubé	803	1.4	N/A	$25.71
Total valid votes/expense limit			58,949	97.8	–	$119,339.41
Total rejected ballots			1,355	2.2
Turnout			60,304	66.4
Eligible voters			90,835
	Bloc Québécois hold		Swing		-4.9
Source: Elections Canada[18]