Treaty of Lausanne

The Treaty of Lausanne was signed on 24 July 1923 in Lausanne, Switzerland, between Turkey (represented by İsmet İnönü) and the principal Allied Powers, including the British Empire, France, Italy, Japan, Greece, Romania, and the Kingdom of Serbs, Croats and Slovenes. It formally ended the state of war that had persisted between the Ottoman Empire/Turkey and the Allies since World War I, and superseded the punitive Treaty of Sèvres (1920), which the Grand National Assembly in Ankara had rejected.

The treaty followed the Turkish War of Independence (1919–1922), in which forces under Mustafa Kemal (later Atatürk) defeated Greek armies in Anatolia and forced a renegotiation of postwar terms. Key provisions included:

• Recognition of the Republic of Turkey and its sovereignty over Anatolia and Eastern Thrace.
• Border definitions with Greece, Bulgaria, and the British and French mandates of Iraq and Syria. The Mosul question was deferred and later settled in favor of Iraq by the League of Nations in 1926.
• Abolition of the capitulations, the extraterritorial privileges long enjoyed by foreign powers in Ottoman territory.
• Renunciation by Turkey of claims to former Ottoman territories in the Arab world, Cyprus, and the Dodecanese.
• The Straits regime, demilitarizing the Bosphorus and Dardanelles under an international commission (later revised by the Montreux Convention of 1936).
• Protection of minorities, particularly non-Muslim communities in Turkey and Muslims in Greece.

A separate Convention Concerning the Exchange of Greek and Turkish Populations, signed on 30 January 1923, mandated a compulsory population exchange affecting roughly 1.6 million people, based primarily on religion.

Lausanne is widely regarded as one of the few WWI-era settlements to remain largely intact. It is frequently invoked in contemporary disputes over Aegean maritime boundaries, Kurdish self-determination, and the status of Cyprus.