The June 2019 Istanbul mayoral election was held on 23 June 2019. It was a repeat of the March 2019 mayoral election, which was annulled by the Supreme Electoral Council (YSK) on 6 May 2019. The original election had resulted in a narrow 0.2% margin of victory for opposition candidate Ekrem İmamoğlu, causing the governing Justice and Development Party to successfully petition for a by-election.

The March 2019 Istanbul mayoral election took place on 31 March 2019, as part of the 2019 Turkish local elections. In addition to a mayor for the Istanbul Metropolitan Municipality, all 39 Istanbul districts elected their own individual mayors as well as district councillors.