The Memorial Day in Azerbaijan is a public holiday in Azerbaijan for honoring and mourning the military personnel who have died while serving in the Azerbaijani Armed Forces during the 2020 Nagorno-Karabakh war, officially labelled as The Patriotic War. Established by the decree of the President of Azerbaijan, dated 2 December 2020, the holiday is held on 27 September, the day when the war began.

The Second Nagorno-Karabakh War was an armed conflict in 2020 that took place in the disputed region of Nagorno-Karabakh and the surrounding occupied territories. It was a major escalation of an unresolved conflict over the region, involving Azerbaijan, Armenia and the self-declared Armenian breakaway state of Artsakh. The war lasted for 44 days and resulted in Azerbaijani victory, with the defeat igniting anti-government protests in Armenia. Post-war skirmishes continued in the region, including substantial clashes in 2022.