List of premiers of Alberta by time in office

Premiers of Alberta by time served in office as of February 10, 2021. The Premier always stays in office during an election campaign. That time is included in the total, even if the Premier is defeated.

Progressive Conservative Association of Alberta (7)   Alberta Liberal Party (3)   Alberta Social Credit Party (3)   United Farmers of Alberta (3)   Alberta New Democratic Party (1)   United Conservative Party (1)

Rank (by time in office)	Name	Incumbency [Note 1]	Dates in Power	Mandates
1	Ernest Manning	25 years, 195 days	1943-05-31 to 1968-12-12	7
2	Peter Lougheed	14 years, 52 days	1971-09-10 to 1985-11-01	4
3	Ralph Klein	14 years, 0 days	1992-12-14 to 2006-12-14	4
4	John Edward Brownlee	8 years, 229 days	1925-11-23 to 1934-07-10	2
5	William Aberhart	7 years, 262 days	1935-09-03 to 1943-05-23	2
6	Arthur Sifton	7 years, 157 days	1910-05-26 to 1917-10-30	2
7	Don Getty	7 years, 42 days	1985-11-1 to 1992-12-13	2
8	Ed Stelmach	4 years, 297 days	2006-12-14 to 2011-10-07	1
9	Alexander Cameron Rutherford	4 years, 266 days	1905-09-02 to 1910-05-26	2
10	Herbert Greenfield	4 years, 102 days	1921-08-12 to 1925-11-23	1[Note 2]
11	Rachel Notley	3 years, 341 days	2015-05-24 to 2019-04-30	1
12	Charles Stewart	3 years, 287 days	1917-10-30 to 1921-08-13	0
13	Harry Strom	2 years, 272 days	1968-12-12 to 1971-09-10	0
14	Alison Redford	2 years, 167 days	2011-10-07 to 2014-03-23	1
15	Jason Kenney (incumbent)	1 year, 286 days	2019-04-30 to present	1
16	Richard Gavin Reid	1 year, 55 days	1934-07-10 to 1935-09-03	0
17	Jim Prentice	251 days	2014-09-15 to 2015-05-24	0
18	Dave Hancock	176 days	2014-03-23 to 2014-09-15	0

Notes

1. There was no Premier of Alberta from May 23 until May 31, 1943, due to the death of Premier Aberhart.
2. The United Farmers of Alberta won the 1921 election without a leader. Greenfield was made leader immediately afterward, and this election is counted as a win for Greenfield.