An Arab League Day of Mourning is a day marked by mourning and memorial activities in member states of the Arab League. They are declared by the union and are separate from national days of mourning, which are designated at the national level. As of October 2023, the Arab League has declared Days of Mourning four times.
Background.
The concept introduced on 4 August 2005 by the Arab League in Cairo, a day after the death of King Fahd of Saudi Arabia. The Arab League declared three days of mourning and an Arab summit scheduled in Egypt was cancelled. Later, three days of mourning were observed for the death of Emirs of Kuwait Jaber in 2006 and Sabah in 2020. 
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