The national flag of Palestine (Arabic: علم فلسطين, romanized: ʿalam Filasṭīn) is a tricolour of three equal horizontal stripes—black, white, and green from top to bottom—overlaid by a red triangle issuing from the hoist. It displays the pan-Arab colours, which were first combined in the current style during the 1916 Arab Revolt, and represents the Palestinian people and the State of Palestine.

Used since the 1920s, the Palestinian flag's overall design is almost identical to the flag of the Arab Revolt, with the pan-Arab colours representing four historical Arab dynasties. It was flown during the 1936–1939 Arab revolt in Palestine and has also been used extensively in the Israeli–Palestinian conflict, especially after it was officially adopted as the Palestinian people's flag when the Palestine Liberation Organization (PLO) was founded in 1964. Since 2015, the State of Palestine has observed a Flag Day every 30 September. Since 2021, the Palestinian flag has been lowered to half-mast every 2 November to lament the 1917 Balfour Declaration, which was issued by the United Kingdom, supporting a "national home for the Jewish people" in what was then Ottoman Palestine. Wikipedia