The 1917 Canadian federal election was held on December 17, 1917. Described by historian Michael Bliss as the "most bitter election in Canadian history", it was fought mainly over the issue of conscription (see Conscription Crisis of 1917). The election resulted in Prime Minister Sir Robert Borden's Unionist government elected with a strong majority.

The previous election had been held in 1911, and was won by Borden's Conservatives. Under the elections law, Canada should have had an election in 1916. However citing the emergency of the First World War, the government postponed the election, largely in hope that a coalition government could be formed, as was the case in Britain.

Sir Wilfrid Laurier, head of the Liberal Party of Canada, refused to join the coalition over the issue of conscription. Conscription was strongly opposed in the Liberal heartland of Quebec. Laurier worried that agreeing to Borden's coalition offer would cause that province to abandon the Liberals, and perhaps Canada as well. Borden proceeded to form a "Unionist" government, and the Liberal Party split over the issue. Many English Canadian Liberal MPs and provincial Liberal parties in English Canada supported the new Unionist government.

To ensure victory for conscription, Borden introduced two laws to skew the voting towards the government. The first of these, the Wartime Elections Act, disenfranchised conscientious objectors and Canadian citizens who were born in enemy countries who had arrived after 1902. The law also gave female relatives of servicemen the vote. Thus, the 1917 election was the first federal election in which some women were allowed to vote. The other new law was the Military Voters Act that allowed soldiers serving abroad to choose which riding their vote would be counted in. This allowed government officials to guide the strongly pro-conscription soldiers into voting in those ridings where the government felt they would be most useful.

Soon after these measures were passed, Borden convinced a faction of Liberals (using the name Liberal-Unionists) along with Gideon Decker Robertson who was described as a "Labour" Senator (but was unaffiliated with any Labour Party) to join with them, forming the Unionist government in October 1917. He then dissolved parliament to seek a mandate in the election which pitted "Government" candidates, running as the Unionist Party, against the anti-Conscription faction of the Liberal Party which ran under the name Laurier Liberals.

The divisive debate ended with the country divided on linguistic lines. The Liberals won 82 seats, 62 of which were in Quebec. The Unionists won 183 seats. The three Unionist seats in Quebec were all in mainly anglophone ridings.

See also: Conscription crisis of 1917

National results

Party		Party Leader	# of candidates	Seats			Popular Vote
				Before	After	% Change	#	%	% Change	Government (Unionist)(1)	Robert Borden	211	131	152	+16.0	1,070,694	56.93	+8.90	Opposition (Laurier Liberals)(1)	Wilfrid Laurier	213	85	82	-3.5	729,756	38.80	-7.02	Labour		22	1	0	-100.0	34,558	1.84	+0.91	Opposition-Labour		8	0	0	0	22,251	1.03	0
	Independent		5	0	0	0	12,023	0.64	-0.15
	Independent Liberal		2	0	0	0	7,753	0.41	0	Unknown		12	0	0	0	3,773	0.20	-1.78
	Non-Partisan League		3	0	0	0	2,863	0.15	0
Total			476	221	234	+5.9	1,880,702	100.00
Sources: http://www.elections.ca -- History of Federal Ridings since 1867

Notes:

"Previous" refers to the results from the previous election, and not to the standings in the House of Commons at dissolution.

(1) % change for Government compared to Conservative Party in 1911 election, and for Opposition to Liberal Party.

Results by province

Party Name			BC	AB	SK	MB	ON	QC	NB	NS	PE	YK	Total	Government	Seats:	13	11	16	14	74	3	7	11	2	1	152
	Popular Vote (%):	68.4	61.0	74.1	79.7	62.3	24.7	59.4	48.4	49.8	54.3	56.9	Opposition		Seats:	-	1	-	1	8	62	4	4	2	-	82
	Vote (%):	25.6	30.6	23.4	20.3	32.1	73.4	40.6	45.5	50.2	45.7	38.8
Total Seats			13	12	16	15	82	65	11	15	4	1	234
Parties that won no seats:														Labour	Vote (%):	5.6	0.8			2.3	0.3		6.1			1.8
	Opposition-Labour	Vote (%):		5.0	2.6		1.2						1.0
	Independent	Vote (%):		0.5			1.2	0.5					0.6
	Independent Liberal	Vote (%):					0.8	0.5					0.4
	Unknown	Vote (%):	0.4				0.1	0.7					0.2
	Non-Partisan League	Vote (%):		2.2									0.2