The Ottoman Empire ended through a sequence of political events between the end of the First World War and the establishment of the Republic of Turkey, rather than on one universally meaningful date. The Ottoman government signed the Armistice of Mudros on 30 October 1918, effectively ending its participation in the First World War. Allied occupation of strategic Ottoman territories followed, and the empire's future became the subject of international negotiations.
The Treaty of Sevres in 1920 proposed a drastic reduction and partition of Ottoman territories, but it was rejected by the Turkish nationalist movement led by Mustafa Kemal. The Ottoman sultanate was formally abolished by the Grand National Assembly in Ankara on 1 November 1922, which ended the Ottoman dynasty's political sovereignty over the Turkish state. The last sultan, Mehmed VI, left Istanbul shortly afterwards. The Republic of Turkey was proclaimed on 29 October 1923, and the Treaty of Lausanne was signed in July 1923 and came into force after ratification. The Ottoman caliphate survived until 3 March 1924, when it too was abolished by the Turkish Republic.
The First World War was the immediate context for the empire's final collapse. The Ottoman Empire entered the war in 1914 after aligning with Germany and the other Central Powers. Ottoman forces fought in the Caucasus, Mesopotamia, Palestine, Arabia, the Dardanelles and elsewhere. The Gallipoli campaign of 1915 and 1916 produced a major Ottoman defensive victory against the British and French expedition, but other fronts became increasingly difficult.
Russia's withdrawal from the war after the 1917 revolution altered the eastern front, while British forces eventually captured Baghdad, Jerusalem and other strategic positions. The Arab Revolt beginning in 1916 challenged Ottoman authority in the Arabian Peninsula and parts of the Levant. By 1918 Ottoman military resources were severely strained. The armistice therefore represented the military end of the empire's participation in the war even though the legal and political structures of the Ottoman state remained temporarily in existence.
The Armistice of Mudros placed the Ottoman government in a highly vulnerable position. Allied forces gained rights to occupy strategic locations and subsequently occupied Istanbul. Ottoman territory was subjected to military and political intervention, while nationalist resistance developed in Anatolia. The Treaty of Sevres, signed in 1920, envisaged extensive territorial losses and international control over various areas. It also recognised proposed arrangements affecting Armenia, Greece, the Kurdish regions and former Arab provinces, although many provisions were never implemented as written.
The nationalist movement based in Ankara rejected the treaty and established an alternative political authority through the Grand National Assembly. Mustafa Kemal and his supporters organised military resistance against occupying forces and against territorial arrangements they considered unacceptable. The resulting Turkish War of Independence transformed the balance of power and made the restoration of the old Ottoman political system increasingly impossible.
The abolition of the sultanate on 1 November 1922 is the clearest date for the end of the Ottoman Empire as a sovereign dynastic state. The Grand National Assembly in Ankara declared that sovereignty belonged to the nation and abolished the office of the sultan. Mehmed VI departed Constantinople, which remained occupied by Allied forces for a period. His cousin Abdulmecid II was later appointed caliph, but he held no sultanic political authority.
This distinction is important because the caliphate and sultanate were not identical institutions. The sultanate represented the Ottoman dynastic political authority, while the caliphate was a religious institution associated with the Ottoman dynasty during its later history. By abolishing the sultanate first, the Turkish nationalist leadership ended the Ottoman monarchy while temporarily retaining the caliphate as a separate institution.
The Republic of Turkey was proclaimed on 29 October 1923, establishing a republican political system under the leadership of Mustafa Kemal, later known as Ataturk. The Treaty of Lausanne, signed on 24 July 1923, replaced the unimplemented Treaty of Sevres and established the international legal framework for the sovereignty of the new Turkish state. Lausanne recognised Turkish sovereignty over Anatolia and defined the borders of the new republic, subject to specific arrangements. The treaty did not restore the Ottoman Empire.
Instead, it marked international recognition of a radically transformed political order. The imperial government, dynasty and multinational territorial structure had been replaced by a nation state centred on Anatolia and eastern Thrace. Many former Ottoman territories were already under other forms of administration or had become separate states. The end of the empire was therefore also part of the wider dissolution of Ottoman imperial territory.
The abolition of the caliphate on 3 March 1924 is sometimes described as the final institutional end of the Ottoman system, although the caliphate had already been separated from the sultanate and possessed no sovereign state authority after 1922. Abdulmecid II was the final Ottoman caliph and was removed from office when the Turkish Grand National Assembly abolished the institution. Other members of the Ottoman dynasty were expelled from Turkey.
The abolition formed part of a broader programme of secularising and centralising reforms under the new republic. Religious courts and educational institutions were reorganised, and the legal and administrative system increasingly adopted modern national institutions. The distinction between 1922, 1923 and 1924 therefore reflects different definitions of what it means for an empire to end. For political sovereignty, 1922 is especially significant; for the establishment of the republic, 1923 is crucial; and for the final abolition of a major Ottoman dynastic religious institution, 1924 is important.
The end of the Ottoman Empire did not mean that Ottoman institutions, populations and cultural traditions disappeared immediately. Former Ottoman territories became part of numerous new states, mandates and political arrangements. The Balkans had already experienced major territorial transformations before 1918, while Arab provinces were reorganised after the First World War under new states and European mandates. Millions of people experienced displacement, migration, resettlement and changes in citizenship.
The population exchange between Greece and Turkey in 1923 caused enormous demographic change, with exceptions for certain communities in Istanbul and western Thrace. Ottoman administrative practices, legal traditions, architectural heritage and cultural institutions continued to influence successor societies. Ottoman history therefore cannot be reduced to the disappearance of a government in 1922 or 1923. Its institutional and cultural consequences continued throughout the twentieth century and remain visible in the present.
The question of when the Ottoman Empire ended therefore requires a distinction between military defeat, political abolition, international recognition and institutional dissolution. The empire's military participation in the First World War ended in 1918, but the Ottoman government remained formally in existence. The sultanate was abolished in 1922, ending the Ottoman monarchy as a sovereign political institution. The Republic of Turkey was proclaimed in 1923 and received international recognition through the Treaty of Lausanne.
The caliphate was abolished in 1924, removing the last major Ottoman dynastic institution retained by the new Turkish state. Historians consequently use different dates depending on the precise question being asked. The most direct answer to when the Ottoman Empire ended as an empire is 1922, when the sultanate was abolished, while 1923 and 1924 mark further stages in the creation of the post Ottoman political order.
