The 15th Alberta Legislative Assembly was in session from February 13, 1964, to April 14, 1967, with the membership of the assembly determined by the results of the 1963 Alberta general election held on June 17, 1963. The Legislature officially resumed on February 13, 1964, and continued until the fifth session was prorogued on April 11, 1967, and dissolved on April 14, 1967, prior to the 1967 Alberta general election.