The 3rd Alberta Legislative Assembly was in session from September 16, 1913, to April 5, 1917, with the membership of the assembly determined by the results of the 1913 Alberta general election held on April 17, 1913. The Legislature officially resumed on September 16, 1913, and continued until the fifth session was prorogued on April 17, 1917 and dissolved on May 14, 1917, prior to the 1917 Alberta general election. The total number of seats in the assembly was increased from 41 contested in the 1913 election to 56.