Canadian federal elections have provided the following results in Montérégie.

This article does not cite any sources. (December 2009)

Montérégie stretches from Montreal's South Shore suburbs into the countryside to the east. The former have been a battleground between the Liberals and the Bloc Québécois because of the collapse of the Progressive Conservative Party in 1993. The more rural ridings of Saint-Jean, Verchères—Les-Patriotes and Chambly—Borduas are Bloquist strongholds. Vaudreuil-Soulanges, west of Montreal, has a significant Anglophone population and can usually be expected to vote Liberal—its 2004 fall to the BQ on election night was one of the biggest surprises on election night. The fallout from the sponsorship scandal allowed the Bloc to sweep the region in 2006 for the first time, although the Liberals regained the traditional Liberal seat of Brossard-La Prairie in 2008, albeit on a judicial recount. Conservative support picked up significantly in the rural areas but remains very low in the suburban areas.

However, these distinctions were overwhelmed by the surge of NDP support in Quebec in the 2011 election, with the party sweeping every seat in this region by wide margins—in no case by less than 3,500 votes, and in several cases by nearly or more than 10,000 votes. In a huge reversal of fortunes, the NDP was cut down to just 3 seats in the region during the 2015 election, in which the Liberals surged to captured most of the region's seats. Renewed Bloc strength allowed them to capture several seats at the NDP and Liberals' expense in 2019.

Votes by party throughout time

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Election	Liberal	Conservative	New Democratic	Bloc Québécois	Green	People's	PC	Reform / Alliance	Social Credit	Others
1979	266,648 65.5%	—	26,145 6.4%	—	—	—	53,111 13.0%	—	46,288 11.4%	15,078 3.7%
1980	263,760 71.2%	—	44,365 12.0%	—	—	—	38,278 10.3%	—	8,858 2.4%	15,188 4.1%
1984	146,172 31.5%	—	47,758 10.3%	—	—	—	242,887 52.3%	—	—	27,247 5.9%
1988	127,216 26.9%	—	76,574 16.2%	—	2,401 0.5%	—	253,213 53.6%	—	—	13,106 2.8%
1993	170,303 32.1%	—	8,550 1.6%	291,875 54.9%	—	—	54,495 10.3%	—	—	6,080 1.1%
1997	173,622 33.8%	—	8,203 1.6%	223,092 43.5%	—	—	106,618 20.8%	573 0.1%	—	1,141 0.2%
2000	203,719 41.1%	—	7,306 1.5%	218,637 44.1%	—	—	26,635 5.4%	29,319 5.9%	—	10,157 2.0%
2004	159,300 31.2%	34,538 6.8%	20,296 4.0%	278,693 54.6%	15,284 3.0%	—	—	—	—	2,779 0.5%
2006	100,172 18.4%	112,042 20.5%	39,915 7.3%	269,728 49.5%	22,281 4.1%	—	—	—	—	1,090 0.2%
2008	115,164 20.9%	96,032 17.4%	71,595 13.0%	247,180 44.9%	19,608 3.6%	—	—	—	—	780 0.1%
2011	71,995 12.6%	62,505 10.9%	258,076 45.2%	158,491 27.7%	11,846 2.1%	—	—	—	—	8,343 1.5%
2015	229,488 35.4%	70,192 10.8%	170,173 26.3%	157,783 24.4%	17,790 2.7%	—	—	—	—	2,288 0.4%
2019	238,039 35.8%	58,978 8.9%	61,000 9.2%	263,940 39.7%	34,858 5.2%	5,780 0.9%	—	—	—	1,821 0.3%
2021	221,114 35.2%	67,209 10.7%	53,232 8.5%	256,136 40.8%	8,256 1.3%	13,227 2.1%	—	—	—	8,891 1.4%

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Liberal   Conservative   New Democratic   Bloc Québécois

Green   Progressive Conservative (defunct)   Alliance / Reform (defunct)   Social Credit (defunct)