20th Alberta Legislature
Majority parliament
10 March 1983 – 10 April 1986
Parliament leaders
Premier	Peter Lougheed September 10, 1971 – November 1, 1985
	Don Getty November 1, 1985 – December 14, 1992
Cabinets	Lougheed cabinet Getty cabinet
Leader of the Opposition	Grant Notley November 2, 1982 – October 19, 1984
	Ray Martin November 6, 1984 – June 15, 1993
Party caucuses
Government	Progressive Conservative Association of Alberta
Opposition	New Democratic Party
Legislative Assembly
Speaker of the Assembly	Gerard Amerongen March 2, 1972 – June 11, 1986
Members	79 MLA seats
Sovereign
Monarch	Elizabeth II February 6, 1952 – September 8, 2022
Lieutenant Governor	Hon. Frank C. Lynch-Staunton October 18, 1979 – January 22, 1985
	Hon. Helen Hunley January 22, 1985 – March 11, 1991
Sessions
1st session March 10, 1983 – March 2, 1984
2nd session March 15, 1984 – March 13, 1985
3rd session March 14, 1985 – April 2, 1986
4th session April 3, 1986 – April 10, 1986
← 19th → 21st

The 20th Alberta Legislative Assembly was in session from March 10, 1983, to April 10, 1986, with the membership of the assembly determined by the results of the 1982 Alberta general election held on November 2, 1982. The Legislature officially resumed on March 10, 1983, and continued until the fourth session was prorogued and dissolved on April 10, 1986, prior to the 1986 Alberta general election on May 8, 1986.^[1]

Alberta's twentieth government was controlled by the majority Progressive Conservative Association of Alberta for the fourth time, led by Premier Peter Lougheed until his resignation, he was replaced by Don Getty. The Official Opposition was led by Grant Notley of the New Democratic Party until his death on October 19, 1984, and later Ray Martin. The Speaker was Gerard Amerongen who would serve in the role until he was defeated in the 1986 Alberta general election.

Party standings after the 20th General Election

• A party requires four seats to have official party status in the legislature. Parties with fewer than four seats are not entitled to party funding although their members will usually be permitted to sit together in the chamber.

Members elected

For complete electoral history, see individual districts.