The 29th Alberta Legislative Assembly was constituted after the general election on May 5, 2015.

The New Democrats, led by Rachel Notley, won a majority of seats and formed the government.

The Wildrose Party, which won the second most seats, formed the official opposition until July 2017, when it merged with the Progressive Conservatives, to become the United Conservative Party, which then became the official opposition.

Official Seating Plan (Retrieved July 19, 2017) The merger of the Wildrose and Progressive Conservatives in late July 2017 created the United Conservative caucus, which was recognized by the Speaker's office as the official opposition,[2] among other changes to party affiliations.

Official Seating Plan (Retrieved March 14, 2018)