The members of the 25th Alberta Legislative Assembly were elected in the general election held on March 12, 2001 and, with the exception of the three MLAs listed below, held their seats until dissolution of the legislature on October 25, 2004.

On November 22, 2004, the 26th Alberta general election was held to elect the next legislature.

The 25th Legislative Assembly was ushered in with a massive Progressive Conservative majority, with Alberta being dubbed Ralph's World following the 2001 general election. The official opposition Liberals began a turbulent period that would see the party go through four leaders.

The third party Alberta New Democrats also changed leaders in July 2004 with the retirement of Raj Pannu.

Towards the end of the legislature for the first time since 1985, a new party caucus was formed. Edmonton-Norwood MLA Gary Masyk would cross the floor to the Alberta Alliance which had been formed in 2002 and registered in 2003 creating the caucus for that party. His reason for leaving was the Premier's interference in the 2004 federal election that coincided with a sharp decline in poll numbers that kept the federal Conservatives from winning the election. His electoral district was also abolished in the 2004 Alberta Boundary Re-distribution.

Support the Progressive Conservatives softened through the reign of the Assembly but still remained high during the 2004 general election.

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