The Yalta Conference, sometimes called the Crimea Conference and codenamed the Argonaut Conference, held February 4–11, 1945 , was the wartime meeting of the heads of government of the United States, the United Kingdom, and the Soviet Union, represented by President Franklin D. Roosevelt, Prime Minister Winston Churchill, and General Secretary Joseph Stalin, respectively, for the purpose of discussing Europe's post-war reorganization. The conference convened in the Livadia Palace near Yalta, in the Crimea.

The meeting was intended mainly to discuss the re-establishment of the nations of war-torn Europe. Within a few years, with the Cold War dividing the continent, Yalta became a subject of intense controversy. To some extent, it has remained controversial.

Yalta was the second of three wartime conferences among the Big Three (Churchill, Roosevelt and Stalin). It had been preceded by the Tehran Conference in 1943, and it was followed by the Potsdam Conference in July 1945, which was attended by Harry S Truman, who replaced the late Roosevelt, Stalin, and Churchill, who was replaced mid-point by the newly elected British Prime Minister Clement Attlee.

Yalta (Ukrainian and Russian: Я́лта, Crimean Tatar: Yalta) is a city in Crimea, southern Ukraine, on the north coast of the Black Sea. The city is located on the site of an ancient Greek colony, said to have been founded by Greek sailors who were looking for a safe shore (γιαλός – yalos in Greek) on which to land. It is situated on a deep bay facing south towards the Black Sea, surrounded by wooded mountains. It enjoys a warm Mediterranean climate with many vineyards and orchards in the vicinity.

The term "The Greater Yalta" is used to designate a part of the Crimean southern coast spanning from Foros in the west to Gurzuf in the east and including the city of Yalta and multiple adjacent urban settlements (the area of the Greater Yalta is marked dark blue on the map).

The existence of Yalta was first recorded in the 12th century by an Arab geographer, who described it as a Byzantine port and fishing settlement. It became part of a network of Genoese trading colonies on the Crimean coast in the 14th century, when it was known as Etalita or Galita. Crimea was captured by the Ottoman Empire in 1475, which made it a semi-independent subject territory under the rule of the Crimean Khanate but the southern coast with Yalta was under direct ottoman rule forming the Eyalet of Kefe (Feodosiya). Yalta was annexed by the Russian Empire in 1783, along with the rest of Crimea, sparking the Russo-Turkish War, 1787-1792. Prior to the annexation of the Crimea, the Crimean Greeks were moved to Mariupol in 1778; one of the villages they established nearby is also called Yalta.

Sir Winston Leonard Spencer-Churchill, KG, OM, CH, TD, PC, DL, FRS, Hon. RA (30 November 1874 – 24 January 1965) was a British Conservative politician and statesman known for his leadership of the United Kingdom during the Second World War. Widely regarded as one of the greatest wartime leaders of the century, he served as Prime Minister twice (1940–45 and 1951–55). A noted statesman and orator, Churchill was also an officer in the British Army, a historian, a writer, and an artist. He is the only British prime minister to have received the Nobel Prize in Literature, and was the first person to be made an Honorary Citizen of the United States.

Churchill was born into the aristocratic family of the Dukes of Marlborough. His father, Lord Randolph Churchill, was a charismatic politician who served as Chancellor of the Exchequer; his mother, Jenny Jerome, was an American socialite. As a young army officer, he saw action in British India, the Sudan, and the Second Boer War. He gained fame as a war correspondent and wrote books about his campaigns.

Joseph Vissarionovich Stalin (Russian: Иосиф Виссарионович Сталин; born Iosif Vissarionovich Dzhugashvili, Russian: Иосиф Виссарионович Джугашвили; 18 December 1878 – 5 March 1953) was the Premier of the Soviet Union from 6 May 1941 to 5 March 1953. He was among the Bolshevik revolutionaries who brought about the October Revolution in Russia in 1917 and later held the position of General Secretary of the Communist Party of the Soviet Union's Central Committee from 1922 until his death in 1953. While the office of the General Secretary was officially elective and not initially regarded as the top position in the Soviet state, Stalin managed to use it to consolidate more and more power in his hands after the death of Vladimir Lenin in 1924 and gradually put down all opposition groups within the Communist Party. This included Leon Trotsky, a socialist theorist and the principal critic of Stalin among the early Soviet leaders, who was exiled from the Soviet Union in 1929. Whereas Trotsky was an exponent of permanent revolution, it was Stalin's concept of socialism in one country that became the primary focus of Soviet politics.

World War I (WWI), which was predominantly called the World War or the Great War from its occurrence until 1939 (World War II), and the First World War or World War I thereafter, was a major war centred in Europe that began on 28 July 1914 and lasted until 11 November 1918. It involved all the world's great powers, which were assembled in two opposing alliances: the Allies (based on the Triple Entente of the United Kingdom, France and Russia) and the Central Powers (originally centred around the Triple Alliance of Germany, Austria-Hungary and Italy; but, as Austria–Hungary had taken the offensive against the agreement, Italy did not enter into the war). These alliances both reorganised (Italy fought for the Allies), and expanded as more nations entered the war. Ultimately more than 70 million military personnel, including 60 million Europeans, were mobilised in one of the largest wars in history. More than 9 million combatants were killed, largely because of enormous increases in lethality of weapons, thanks to new technology, without corresponding improvements in protection or mobility. It was the sixth-deadliest conflict in world history, subsequently paving the way for various political changes such as revolutions in the nations involved.