The Caucasus Campaign comprised armed conflicts between the Ottoman Empire and the Russian Empire, later including Azerbaijan, Armenia, Central Caspian Dictatorship and the UK as part of the Middle Eastern theatre or alternatively named as part of the Caucasus Campaign during World War I. The Caucasus Campaign extended from the Caucasus to the Eastern Asia Minor region, reaching as far as Trabzon, Bitlis, Muş and Van. The land warfare was accompanied by the Russian navy in the Black Sea Region of the Ottoman Empire.

On February 23, 1917, the Russian advance was halted following the Russian Revolution, and later the disintegrated Russian Caucasus Army was replaced by the forces of the newly established Armenian state, comprised from the previous Armenian volunteer units and the Armenian irregular units. During 1918 the region also saw the establishment of the Central Caspian Dictatorship, the Republic of Mountainous Armenia and an Allied force named Dunsterforce which was composed of elite troops drawn from the Mesopotamian and Western Fronts. The Ottoman Empire and German Empire had a hot conflict at Batumi with the arrival of German Caucasus Expedition whose prime aim was to secure oil supplies.

The Caucasus, also Caucas or Caucasia (for endonyms, see below), is a geopolitical region at the border of Europe and Asia, and situated between the Black and the Caspian sea. It is home to the Caucasus Mountains, which contain Europe's highest mountain, Mt. Elbrus. Politically, the Caucasus region is separated between northern and southern parts.

The northern portion of the Caucasus is known as the Ciscaucasus and the southern portion as the Transcaucasus.

The Ciscaucasus contains the larger majority of the Greater Caucasus Mountain range, also known as the Major Caucasus mountains. It includes Southwestern Russia and northern parts of Georgia and Azerbaijan.

The Transcaucasus is bordered on the north by Russia, on the west by the Black Sea and Turkey, on the east by the Caspian Sea, and on the south by Iran. It includes the Caucasus Mountains and surrounding lowlands. All of Armenia, Azerbaijan (excluding the northern parts) and Georgia (excluding the northern parts) are in South Caucasus.

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.