The 2017 Mount Albert by-election was a New Zealand by-election held in the Mount Albert electorate on 25 February 2017 during the 51st New Zealand Parliament. The seat was vacated following the resignation of David Shearer, a former Leader of the New Zealand Labour Party.

The 51st New Zealand Parliament was elected at the 2014 general election. This Parliament consists of 121 members and was in place from September 2014 until August 2017, followed by the 2017 New Zealand general election. Following the final vote count John Key was able to continue to lead the Fifth National Government.