The Circassian people are an ethnic group native to the Northwest Caucasian region in the former country of Circassia. The vast majority are in the diaspora, while only a handful remain in their historical lands.

The Circassians call themselves Adyghe. The word Circassian is an exonym, while Adyghe is an endonym.
The Circassian language is a subdivision of the Northwest Caucasian languages, and is divided between Adyghe and Kabardian.
During the early spread of Christianity, the Circassians were known as Kassogs and their country as Kassakhi. They were heavily Christianized in the 6th century under Georgian and Byzantine influence. However with the arrival of the Ottoman Empire, the Circassians became Islamized and Sunni Islam became the predominant religion over time.
During the medieval period, Circassian slaves had taken the Mamluk throne and formed the Burji dynasty, leading to the Mamluks becoming a Circassian state. Despite the Mamluk state suffering a defeat to the Ottoman Empire in 1517, the Burji dynasty remained in charge of the Ottoman governance in Egypt.
When the Mongol Empire arrived to the region in the 13th century, they plundered Circassia and referred to them as the Jerkes, which literally means "one who blocks a path". Later, the Russian variant of this term, Cherkes, became exclusively attached to the Adyghe people by the 19th century, and was translated into "Circassian" in Western Europe.
Several legends speak of a prince named Inal who supposedly reunited the Circassian tribes after the Mongols drove them into the high mountains. The claim that he managed to unite the freedom-loving Circassians into a single political entity, is likely a romantic myth. The Circassians evaded complete annihilation by the Mongolians by retreating into the high mountains; in the year 1277, they had been defeated but continued to maintain a degree of independence in these regions.
In 1395, the founder of the Timurid Empire, Tamerlane, engaged in battle with the Circassians, but despite his defeat, he returned with a much larger army in order to conduct a number of raids in the region.
Crimean Tatar missionaries are said to have converted the Circassians to Islam, and many Crimean khans married with Circassian women who were known for their beauty. The Circassians had also rebelled in 1708 because of the tyranny and oppression that they faced from the Tatars. Tatars reportedly attacked Circassians, Russians, and Alans, killing men and capturing women and children, who were then imported to the corners of the earth.
The Russian Empire invaded Circassia in the 18th century, which marked the beginning of the Circassian genocide. Despite desperate attempts of resistance, Russian imperial forces managed to occupy chunks of Circassian territories in the late 19th century. During this period, roughly 1,000,000 to 1,500,000 Circassians perished in massacres, while those who survived were forcibly displaced. These numbers are debated, with others claiming that there is no reliable support or widespread agreement for such estimates. In the end, between 95% and 97% of the population was lost.
From 1891 and onwards, a large amount of Circassians joined the Hamidiye cavalry of the Ottoman Empire. Named after sultan Abdülhamid II, the cavalry would be responsible for the Hamidian massacres which resulted in the deaths of an estimated 80,000 to 300,000 Armenians and other Christian minorities.
Today, approximately 800,000 Circassians still inhabit their former lands in Russia, while 5,000,000 to 7,000,000 live in the diaspora, including roughly 2,000,000 in the Republic of Turkey.
The Circassians began adopting Islam around the 16th century. Before this, they followed indigenous pagan traditions, which made them ideal candidates for military slavery. Today, majority of Circassians follow the Hanafi school of Sunni Islam, though a small minority of them still follow Orthodox Christianity.