The partition of the Ottoman Empire (30 October 1918 – 1 November 1922) was a geopolitical event that occurred after World War I and the occupation of Istanbul by British, French and Italian troops in November 1918. The partitioning was planned in several agreements made by the Allied Powers early in the course of World War I,^[91] notably the Sykes–Picot Agreement, after the Ottoman Empire had joined Germany to form the Ottoman–German Alliance.^[92] The huge conglomeration of territories and peoples that formerly comprised the Ottoman Empire was divided into several new states.^[93] The Ottoman Empire had been the leading Islamic state in geopolitical, cultural and ideological terms. The partitioning of the Ottoman Empire after the war led to the domination of the Middle East by Western powers such as Britain and France, and saw the creation of the modern Arab world and the Republic of Turkey. Resistance to the influence of these powers came from the Turkish National Movement but did not become widespread in the other post-Ottoman states until the period of rapid decolonization after World War II.

After the Ottoman government collapsed completely, its representatives signed the Treaty of Sèvres in 1920, which would have partitioned much of the territory of present-day Turkey among France, the United Kingdom, Greece and Italy. The Turkish War of Independence forced the Western European powers to return to the negotiating table before the treaty could be ratified. The Western Europeans and the Grand National Assembly of Turkey signed and ratified the new Treaty of Lausanne in 1923, superseding the Treaty of Sèvres and agreeing on most of the territorial issues.