The 3 September 1843 Revolution was an uprising by the Hellenic Army in Athens, supported by large sections of the people, against the autocratic rule of King Otto. The rebels, led by veterans of the Greek War of Independence, demanded the granting of a constitution and the departure of the Bavarian officials that dominated the government. The revolution succeeded, ushering the period of constitutional monarchy and universal suffrage in Greece.

Otto was a Bavarian prince who ruled as King of Greece from the establishment of the Kingdom of Greece on 27 May 1832, under the Convention of London, until he was deposed in October 1862.