[[File:Alberta Elections4.gif|thumb|350px|alt=Chart showing number of seats won by each party in each election|
]]
The Canadian province of Alberta holds elections to its unicameral legislative body, the Legislative Assembly of Alberta. The maximum period between general elections of the assembly is five years, but the Lieutenant Governor is able to call one at any time. However, the premier has typically asked the lieutenant governor to call the election in the fourth or fifth year after the preceding election. The number of seats has increased over time, from 25 for the first election in 1905, to the current 87.
Alberta's politics has historically been one of long-lasting governments with government changes being few and far between. The province from 1905 to 2015 was ruled by four "dynasties": the Liberal Party (1905–1921); the United Farmers of Alberta (1921–1935), the Social Credit Party (1935–1971), and the Progressive Conservative (PC) Association (1971–2015), the longest political dynasty in Canada. Since 2015 Alberta has had two different governments: The Alberta New Democratic party led by Rachel Notley (2015-2019) and United Conservative Party (2019 to the present). In every election one party has taken a majority of seats. No minority government has ever been elected in Alberta. Thus, Alberta can be said to have continuously had a dominant-party system for its entire political history, though the dominant party has changed over time.
In 2015, the NDP were elected to government for the first time in Alberta's history. The NDP had Alberta's only one term government thus far.
In 2019, the newly formed United Conservative Party formed the government.
From 1909 to 1959, Alberta elections used a combination of single-member and multi-member districts.
From 1905 to 1924, each voter cast as many votes as seats to be filled in the district.
From 1924 to the present, each voter has been able to cast just one vote.
From 1905 to 1924, plurality was enough to be elected.
From 1924 to 1959, each voter cast a ranked ballot, in a hybrid system of Single Transferable Voting in multi-member districts in the cities and Instant-runoff voting in single-member districts outside the cities, producing proportional representation in the cities and majority-winner results elsewhere. Only Alberta and Manitoba have used a proportional representation system in the history of Canada, although in both provinces it was applied only partially.
Since 1959, Alberta's elections have used single-member plurality, also known as First-past-the-post voting.
Summary
The table below shows the total number of seats won by each political party in each election. Full details on any election are linked via the year of the election at the start of the row, and details for the legislature that followed the election are available at the legislature number.
Note that election results show differences at 1926 and 1959, when different electoral systems were adopted, as described in the "Electoral system" section.
{| class="toccolours sortable" style="margin:0 auto; clear:both; text-align: center;" border="0"
|- style="background: #ccccff"
! scope="col" width="50px" | Year
! scope="col" width="50px" | Seats
! scope="col" width="90px" | Winner
! scope="col" width="50px" | Legislature
! scope="col" width="50px" |United Conservative Party|
! scope="col" width="50px" |Progressive Conservative Association of Alberta|
! scope="col" width="50px" | Liberal
! scope="col" width="50px" | NDP
! scope="col" width="50px" | Social Credit
! scope="col" width="50px" | United Farmers
! scope="col" width="50px" |Dominion Labor
! scope="col" width="50px" |Ind.
! scope="col" colspan="1" | Other elected members
! scope="col" colspan="1" | Other parties
! scope="col" width="50px" | Voter turnout
|-
| scope="row" | 1905
| 25
| |Liberal
|
|
| 3
| 22
|
|
|
|
|
|
|
|
|- style="background: #eeeeee"
| scope="row" | 1909
| 41
| | Liberal
|
|
| 2
| 36
|
|
|
|
| 2
| 1
|
|
|-
| scope="row" | 1913
| 56
| | Liberal
|
|
| 17
| 38
|
|
|
|
|
|
|
|
|- style="background: #eeeeee"
| scope="row" | 1917
| 58
| | Liberal
|
|
| 19
| 34
|
|
|
|
|
| 5
| 2 Alberta Non-Partisan League
2 non-partisan members elected by Soldiers and Nurses voting in 2-seat district (plurality block voting)
|
|-
| scope="row" | 1921
| 61
| | United Farmers
|
|
|
| 15
|
|
| 38
| 4
| 4
|
|
|
|- style="background: #eeeeee"
| scope="row" | 1926
| 60
| | United Farmers
|
|
| 4
| 7
|
|
| 43
| 5
| 1
|
|
|
|-
| scope="row" | 1930
| 63
| | United Farmers
|
|
| 6
| 11
|
|
| 39
| 4
| 3
|
|
|
|- style="background: #eeeeee"
| scope="row" | 1935
| 63
| | Social Credit
|
|
| 2
| 5
|
| 56
|
|
|
|
|
| 81.8%
|-
| scope="row" | 1940
| 57
| | Social Credit
|
|
|
| 1
|
| 36
|
|
|
| 20
|
|
|- style="background: #eeeeee"
| scope="row" | 1944
| 60
| | Social Credit
| 10th
|
|
|
| 2
| 51
|
|
| 3
| 4
|
|
|-
| scope="row" | 1948
| 57
| | Social Credit
| 11th
|
|
| 2
| 2
| 51
|
|
| 2
|
|
|
|- style="background: #eeeeee"
| scope="row" | 1952
| 60
| | Social Credit
| 12th
|
| 2
| 3
| 1
| 53
|
|
| 1
|
|
|
|-
| scope="row" | 1955
| 61
| | Social Credit
| 13th
|
| 3
| 15
| 2
| 37
|
|
| 3
| 1
|
|
|- style="background: #eeeeee"
| scope="row" | 1959
| 65
| | Social Credit
| 14th
|
| 1
| 1
|
| 61
|
|
| 1
| 1
|
|
|-
| scope="row" | 1963
| 63
| | Social Credit
| 15th
|
|
| 2
|
| 60
|
|
|
| 1
|
|
|- style="background: #eeeeee"
| scope="row" | 1967
| 65
| | Social Credit
| 16th
|
| 6
| 3
|
| 55
|
|
| 1
|
|
|
|-
| scope="row" | 1971
| 75
| |
| 17th
|
| 49
|
| 1
| 25
|
|
|
|
|
|
|- style="background: #eeeeee"
| scope="row" | 1975
| 75
| |
| 18th
|
| 69
|
| 1
| 4
|
|
| 1
|
|
| 59.58%
|-
| scope="row" | 1979
| 79
| |
| 19th
|
| 74
|
| 1
| 4
|
|
|
|
|
| 58.71%
|- style="background: #eeeeee"
| scope="row" | 1982
| 79
| |
| 20th
|
| 75
|
| 2
|
|
|
| 2
|
|
| 66.00%
|-
| scope="row" | 1986
| 83
| |
| 21st
|
| 61
| 4
| 16
|
|
|
|
| 2
|
| 47.25%
|- style="background: #eeeeee"
| scope="row" | 1989
| 83
| |
| 22nd
|
| 59
| 8
| 16
|
|
|
|
|
|
| 53.60%
|-
| scope="row" | 1993
| 83
| |
| 23rd
|
| 51
| 32
|
|
|
|
|
|
|
| 60.21%
|- style="background: #eeeeee"
| scope="row" | 1997
| 83
| |
| 24th
|
| 63
| 18
| 2
|
|
|
|
|
|
| 53.75%
|-
| scope="row" | 2001
| 83
| |
| 25th
|
| 74
| 7
| 2
|
|
|
|
|
|
| 53.38%
|- style="background: #eeeeee"
| scope="row" | 2004
| 83
| |
| 26th
|
| 62
| 16
| 4
|
|
|
|
| 1
|
| 45.12%
|-
| scope="row" | 2008
| 83
| |
| 27th
|
| 72
| 9
| 2
|
|
|
|
|
|
| 40.59%
|- style="background: #eeeeee"
| scope="row" | 2012
| 87
| |
| 28th
|
| 61
| 5
| 4
|
|
|
|
| 17
|
| 56.96%
|-
| scope="row" | 2015
| 87
| | NDP
| 29th
|
| 10
| 1
| 54
|
|
|
|
| 22
|
| 58.4%
|-
|2019
|87
| |
| 30th
|63
|
|
|24
|
|
|
|
|
|
| 64.0%
|-
|2023
|87
| |
| 31st
|49
|
|
|38
|
|
|
|
|
|
| 62.4%
|}
Notes
: Known as the Conservative Party prior to 1959. Although it did not win any seats in the cities, the United Farmers won most of the rural seats. Overall it won a majority of the seats in the Legislature and formed government.
In 1955, the SC government was again re-elected with a great majority of the seats but for the first time IRV changed the outcome in four districts. In these districts a SC candidate led in the first count but did not take a majority of the vote and each lost out when votes were transferred as per IRV.