The 3 September 1843 Revolution (Greek: Επανάσταση της 3ης Σεπτεμβρίου 1843; N.S. 13 September), was an uprising by the Greek 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 in Greece.
During the War of Independence, the Greek rebels had passed a series of liberal and progressive constitutions on which the war's provisional governments were based. With the establishment of the monarchy in 1832 and the arrival of the Bavarian prince Otto as king, however, these liberal institutions were discarded. For the next 10 years, Otto and his mainly Bavarian officials would rule in an autocratic manner, causing large-scale resentment amongst a people that had just been liberated from foreign rule. The "Bavarocracy" (Βαυαροκρατία), as it was called, intentionally recalling the periods of "Francocracy" and "Turcocracy", even extended to the use of German alongside Greek in the state administration.
Greek politicians constantly demanded an end to this state of affairs. They wished for the Bavarians, above all the much-despised Major Hess, to be sent back to their country and for a constitution to be granted. However, they did not question the monarchy itself or the power of the king. Indeed, they did not wish to impose a constitution, but demanded that the king grant them one. These demands grew ever stronger as time passed, and cut across the political spectrum: all political parties, the French, the English, and the Russian, expressed them.