Joint Premiers of the Province of Canada were the leaders of the Province of Canada, from the 1841 unification of Upper Canada and Lower Canada until Confederation in 1867.

Following the abortive Rebellions of 1837, Lord Durham was appointed governor in chief of British North America. In his 1839 Report on the Affairs of British North America, he recommended that Upper and Lower Canada be united under a single Parliament, with responsible government. As a result, in 1841, the first Parliament of Canada was convened.

Although Canada East (the former Lower Canada, now Quebec) and Canada West (the former Upper Canada, now Ontario) were united as a single province with a single government, each administration was led by two men, one from each half of the province.

This form of government proved to be fractious and difficult, leading to frequent changes in leadership -- in just 26 years, the joint premiership changed hands eighteen times.

With the 1848 introduction of responsible government, Robert Baldwin and Louis-Hippolyte Lafontaine became the first truly democratic leaders of what would eventually become present-day Canada, and some modern historians view them as essentially Canada's earliest Prime Ministers.

Says Canadian journalist Colby Cosh: "In truth, one or the other was ordinarily recognized as the formal head of government: the Macdonald-Cartier ministry was at times a Cartier-Macdonald ministry, for example, as the first ministership switched from the proto-Ontarian to the proto-Quebecker."

In earlier years, the political groups were loose affiliations rather than modern political parties. The "reformers" allied under the banner of Reformers in Canada West and Patriotes in Canada East, while the "conservatives," meaning supporters of the elitist Family Compact in Canada West and Chateau Clique in Canada East prior to unification, were known as Tories. Although informal alliances existed between each ideological pair, these alliances were not political parties as they exist today.

1854, however, proved a pivotal year in the evolution of Canadian politics. Although the Rouges and the Liberals had already emerged in Canada East, these were relatively fringe groups. In 1854, however, many dissatisfied voters in Canada West turned to the more radical Clear Grit faction, and in order to stay in power traditional reformers in Canada East, under Morin, entered a coalition with the conservatives in Canada West.

The early reformers ultimately dissolved as a political entity. Moderate reformers joined the new "Liberal-Conservative" party, later to become the Conservative Party, while the Clear Grits aligned with the Liberals and the Rouges to create the modern Liberal Party, thereby creating the political party structure that prevails today.

The pattern of new protest parties emerging from time to time, and becoming integrated into the mainstream of Canadian political life, was also established by this realignment. Later groups included the Progressives, the Cooperative Commonwealth Federation, the Social Credit Party of Canada and the Reform Party of Canada.

List of Joint Premiers of the Province of Canada

(titular premier is capitalized):

#	Name (Canada West)	Name (Canada East)	Took Office	Left Office
1.	Samuel Harrison (Reform) William Draper (Conservative)1		February 5, 1841	January 12, 1842
2.	William Draper	Charles Richard Ogden	January 12, 1842	September 14, 1842
3.	Robert Baldwin	Sir Louis-Hippolyte Lafontaine	September 26, 1842	November 27, 1843
4.		Sir Dominick Daly (acting premier)2	November 27, 1843	December 12, 1843
5.	William Draper	Denis-Benjamin Viger	December 12, 1843	June 17, 1846
6.	William Draper	Denis-Benjamin Papineau	June 17, 1846	May 28, 1847
7.	Henry Sherwood	Denis-Benjamin Papineau	May 28, 1847	March 11, 1848
8.	Robert Baldwin	Sir Louis-Hippolyte Lafontaine	March 11, 1848	October 28, 1851
9.	Sir Francis Hincks	Augustin-Norbert Morin	October 28, 1851	September 11, 1854
10.	Sir Allan Napier MacNab	Augustin-Norbert Morin	September 11, 1854	January 27, 1855
11.	Sir Allan Napier MacNab	Sir Etienne-Paschal Taché	January 27, 1855	May 24, 1856
12.	Sir John A. Macdonald	Sir Etienne-Paschal Taché	May 24, 1856	November 26, 1857
13.	Sir John A. Macdonald	Sir George-Etienne Cartier	November 26, 1857	August 2, 1858
14.	George Brown	Antoine-Aimé Dorion	August 2, 1858	August 6, 1858
15.	Sir John A. Macdonald	Sir George-Etienne Cartier	August 6, 1858	May 24, 1862
16.	John Sandfield Macdonald	Louis Sicotte	May 24, 1862	May 15, 1863
17.	John Sandfield Macdonald	Antoine-Aimé Dorion	May 15, 1863	May 30, 1864
18.	Sir John A. Macdonald	Sir Etienne-Paschal Taché	May 30, 1864	July 30, 1865
19.	Sir John A. Macdonald	Sir Narcisse-Fortunat Belleau	July 30, 1865	June 30, 1867

Colour key:

• Green - reformers (Reformers, Rouges, etc.)
• Yellow - conservatives (see Family Compact, Château Clique)
• Red - Liberal Party
• Blue - Conservative Party

Notes:
(1) This was a coalition of the moderate wings of the conservative and reform factions, rather than a regionally-based one.
(2) All members of the governing Lafontaine-Baldwin coalition, except Daly, resigned in a protest over unapproved patronage appointments by the British-appointed governor: "the Metcalfe crisis". Daly would continue on as a member of the successor cabinet, headed by Draper.

See also:

• List of elections in the Province of Canada
• List of Canadian Prime Ministers