The 12th Alberta Legislative Assembly lasted from 1955 to 1959. The Social Credit government led by Premier Ernest Manning won a 6th term in office with a reduced majority. The Liberals formed the strongest opposition in a decade and the rest of the opposition was divided between the Conservatives, Co-operative Commonwealth and Independents.

Standings changes since the 13th general election

Affiliation		Members	Social Credit Social Credit Party of Alberta The Alberta Social Credit Party is a provincial political party in Alberta, Canada, that was founded on the social credit monetary policy and conservative Christian social values....	37	Liberal Alberta Liberal Party The Alberta Liberal Party is a provincial political party in Alberta, Canada. Originally founded in 1905, when the province was created, it was the dominant political party until 1921 when it was defeated. It has never been in government since that time...	15	Progressive Conservative Progressive Conservative Association of Alberta The Progressive Conservative Association of Alberta is a provincial centre-right party in the Canadian province of Alberta...	3	Co-operative Commonwealth Alberta New Democratic Party The Alberta New Democratic Party or Alberta NDP is a social-democratic political party in Alberta, Canada, which was originally founded as the Alberta section of the Co-operative Commonwealth Federation...	2	Liberal + Progressive Conservative1	1	Coalition	1	Independent Social Credit	1
Total		61

1. The candidate in Okotoks-High River was jointly nominated by the Progressive Conservative and Liberal parties.

Membership changes in the 13th Assembly
	Date	Name	District	Party	Reason	June 29, 1955	See List of Members			Election day of the 13th Alberta general election Alberta general election, 1955 The Alberta general election of 1955 was the thirteenth general election for the Province of Alberta, Canada. It was held on June 29, 1955 to elect members of the Legislative Assembly of Alberta....	June 3, 1956	John Clark John Etter Clark John Etter Clark was a provincial politician, teacher and farmer from Alberta, Canada. He served as a member of the Legislative Assembly of Alberta from 1952 until his death in 1956. Clark committed one of the worst mass murders in Alberta history before taking his own life.-Early life:John Etter...	Stettler Stettler (provincial electoral district) Stettler was a provincial electoral district in Alberta, Canada. It was mandated to return a single member to the Legislative Assembly of Alberta from 1909 to 1993.-1957 liquor plebiscite:...	Social Credit Social Credit Party of Alberta The Alberta Social Credit Party is a provincial political party in Alberta, Canada, that was founded on the social credit monetary policy and conservative Christian social values....	Committed suicide after murdering seven people	November 15, 1956	Galen Norris Galen Norris Galen Clark Norris was a provincial level politician from Alberta, Canada. He served as a member of the Legislative Assembly of Alberta from 1959 to 1971.-Early life:Galen Clark Noris was born on November 7, 1915...	Stettler	Social Credit	Elected in a by-election	1957	Arthur Smith Arthur Ryan Smith Captain Arthur "Art" Ryan Smith Jr., OC, AOE, DFC was an oilfield worker, fighter pilot, executive business man, magazine editor, he also worked in public relations as an advertising executive and was a Canadian politician on the municipal, provincial and federal levels of government.-Early...	Calgary Calgary (provincial electoral district) Calgary was a provincial electoral district in Alberta, Canada that existed from 1905 to 1913 and was recreated from 1921 to 1959. The district returned from one to six members to the Legislative Assembly of Alberta...	Progressive Conservative Progressive Conservative Association of Alberta The Progressive Conservative Association of Alberta is a provincial centre-right party in the Canadian province of Alberta...	Vacated his seat to run in the 1957 federal election Canadian federal election, 1957 The Canadian federal election of 1957 was held June 10, 1957, to select the 265 members of the House of Commons of Canada. In one of the great upsets in Canadian political history, the Progressive Conservative Party , led by John Diefenbaker, brought an end to 22 years of Liberal rule, as the... .	October 2, 1957	Ernest Watkins Ernest Watkins Ernest Shilston Watkins was a provincial politician and author from Alberta, Canada. He served as a member of the Legislative Assembly of Alberta from 1957 to 1963.-Political career:...	Calgary	Progressive Conservative	Elected in a by-election	December 19, 1958	Frederick Niddrie Frederick Niddrie Frederick James Niddrie was a farmer provincial level politician from Alberta, Canada. He served as a member of the Legislative Assembly of Alberta and sat with the governing Social Credit caucus representing the electoral district of Olds from 1950 until his death in 1958.-Early life:Niddrie was...	Olds Olds (provincial electoral district) Olds was a provincial electoral district in Alberta, Canada. The district was mandated to return a single member to the Legislative Assembly of Alberta from 1909 to 1963. The district was combined with the Didsbury electoral district to form Olds-Didsbury...	Social Credit	Died	February 9, 1959	Roderick Macleod	Olds	Social Credit	Elected in a by-election

External links

• Alberta Legislative Assembly