The 2015 Alberta general election was held on May 5, following a request of Premier Jim Prentice to the Lieutenant Governor of Alberta Donald Ethell to dissolve the Legislative Assembly on April 7. This election elected members to the 29th Alberta Legislature. It was only the fourth time in provincial history that saw a change of governing party, and was the last provincial election for both the Alberta Progressive Conservative and Wildrose parties, which merged in 2017 to form the United Conservative Party.

The Alberta New Democratic Party, commonly shortened to Alberta NDP, is a social-democratic political party in Alberta, Canada. It is the provincial Alberta affiliate of the federal New Democratic Party, and the successor to the Alberta section of the Co-operative Commonwealth Federation and the even earlier Alberta wing of the Canadian Labour Party and the United Farmers of Alberta. From the mid-1980s to 2004, the party abbreviated its name as the "New Democrats" (ND).