List of prime ministers of Canada by time in office

This is a list of Prime Ministers of Canada in order of time served in office as Prime Minister of Canada as of April 10, 2006. This list counts time during an election campaign as belonging to the preceding prime minister. See also List of Canadian political parties by time in office.

Rank	Party	Prime Minister	incumbency	calendar incumbency	terms	breakdown
1	File:Lib-can cropped.png	William Lyon Mackenzie King	7,766 days	21 years, 3 months, 6 days	6	in three blocks: 1,643 days + 1,351 days + 4,772 days
2	File:Conservative Party of Canada.png	Sir John A. Macdonald*	6,934 days	18 years, 11 months, 24 days	6	in two blocks: 2, 319 days + 4,615 days
3	File:Lib-can cropped.png	Pierre Trudeau	5,642 days	15 years, 5 months, 12 days	4	in two blocks: 4,062 days + 1,580 days
4	File:Lib-can cropped.png	Sir Wilfrid Laurier	5,568 days	15 years, 2 months, 29 days	4
5	File:Lib-can cropped.png	Jean Chrétien	3,690 days	10 years, 1 month, 8 days	3
6	File:Conservative Party of Canada.png	Brian Mulroney	3,204 days	8 years, 9 months, 9 days	2
7	File:Conservative Party of Canada.png	Sir Robert Borden	3,196 days	8 years, 9 months, 0 days	2
8	File:Lib-can cropped.png	Louis St. Laurent	3,140 days	8 years, 7 months, 6 days	2
9	File:Conservative Party of Canada.png	John Diefenbaker	2,131 days	5 years, 10 months, 1 day	3
10	File:Conservative Party of Canada.png	Richard Bennett	1,903 days	5 years, 2 months, 16 days	1
11	File:Lib-can cropped.png	Lester B. Pearson	1,825 days	4 years, 11 months, 29 days	2
12	File:Lib-can cropped.png	Alexander Mackenzie	1,796 days	4 years, 11 months, 1 day	1
13	File:Lib-can cropped.png	Paul Martin	787 days	2 years, 1 month, 25 days	1
14	File:Conservative Party of Canada.png	Sir John Thompson	737 days	2 years, 0 months, 7 days	-
15	File:Conservative Party of Canada.png	Arthur Meighen	686 days	1 year, 10 months, 15 days	-	in two blocks: 537 days + 149 days
16	File:Conservative Party of Canada.png	Sir John Abbott	514 days	1 year, 4 months, 26 days	-
17	File:Conservative Party of Canada.png	Sir Mackenzie Bowell	493 days	1 year, 4 months, 6 days	-
18	File:Conservative Party of Canada.png	Joe Clark	273 days	8 months, 28 days	1
19	File:Conservative Party of Canada.png	Kim Campbell	131 days	4 months, 9 days	-
20	File:Lib-can cropped.png	John Turner	79 days	2 months, 18 days	-
21	File:Conservative Party of Canada.png	Sir Charles Tupper	68 days	2 months, 7 days	-
22	File:Conservative Party of Canada.png	Stephen Harper (incumbent)	63 days	2 months, 4 days	1

* Sir John A. Macdonald was also Joint Premier of the Province of Canada for 3,313 days (9 years, 27 days), giving him a total of 10,247 days (28 years, 20 days).