The Cretan Revolt of 1866–1869 (Greek: Κρητική Επανάσταση του 1866) or Great Cretan Revolution (Μεγάλη Κρητική Επανάσταση) was a three-year uprising in Crete against Ottoman rule, the third and largest in a series of between the end of the Greek War of Independence in 1830 and the establishment of the independent Cretan State in 1898.
The Christian Cretans had risen up together with the rest of Greece in the Greek Revolution of 1821, but despite successes in the countryside, the Ottomans held out in the four fortified towns of the northern coast (Chania, Rethymno, Irakleio and Agios Nikolaos) and the island was eventually reconquered by 1828, becoming an Egyptian province (Muhammad Ali's Egypt was a vassal of the Ottoman Empire, but a powerful and semi-independent one with its own military). In 1840, Crete was returned to direct Ottoman rule, followed by an unsuccessful 1841 uprising in support of Union with independent Greece. Another uprising in 1858 secured some privileges, such as the right to bear arms, equality of Christian and Muslim worship, and the establishment of Christian councils of elders with jurisdiction over education and customary and family law. These concessions were resented by the Muslim community, while the Christians pressed for more, while maintaining their ultimate aim of Union with Greece.
As tensions ran high in the island, and several petitions to the Sultan went unanswered, armed bands were formed, and the uprising was officially proclaimed on 21 August 1866. The revolt caused immediate sympathy in Greece, but also elsewhere in Europe. The rebels initially managed to gain control of most of the hinterland although as always the four fortified towns of the north coast and the southern town of Ierapetra remained in Ottoman hands.