The 1920 Nebi Musa riots or 1920 Jerusalem riots took place in British-controlled part of Occupied Enemy Territory Administration (which would shortly become Mandatory Palestine) between Sunday, 4 and Wednesday, 7 April 1920 in and around the Old City of Jerusalem. Five Jews and four Arabs were killed, and several hundred were injured.
The riots coincided with and are named after the Nabi Musa festival, which took place every year on Easter Sunday, and followed rising tensions in Arab-Jewish relations. The events came shortly after the Battle of Tel Hai and the increasing pressure on Arab nationalists in Syria in the course of the Franco-Syrian War. Speeches were given by Arab religious leaders during the festival (in which large numbers of Muslims traditionally gathered for a religious procession), which included slogans referencing Zionist immigration and previous confrontations around outlying Jewish villages in the Galilee. The trigger which turned the procession into a riot is not known with certainty - some evidence exists suggesting Jewish provocation, but it is also possible, though unreported, that Arab activities triggered the riots.
The British military administration of Palestine was criticized for withdrawing troops from inside Jerusalem and because it was slow to regain control. As a result of the riots, trust between the British, Jews, and Arabs eroded. One consequence was that the Jewish community increased moves towards an autonomous infrastructure and security apparatus parallel to that of the British administration.
In its wake, sheikhs of 82 villages round the city and Jaffa, claiming to represent 70% of the population, issued a document protesting the demonstrations against the Jews. This condemnation may have been procured with bribes. Notwithstanding the riots, the Palestinian Jewish community held elections for the Assembly of Representatives on 19 April 1920 among Jews everywhere in Palestine except Jerusalem, where they were delayed to 3 May. The riots also preceded the San Remo conference which was held from 19 to 26 April 1920 at which the fate of the Middle East was to be decided.