Crimean Armenians were the largest part of the Armenian diaspora in the Middle Ages.

The Armenian presence in the Crimea region dates back to the 8th century. The first wave of Armenian immigration into this area began during the mid-11th century and, over time, as political, economic and social conditions in Armenia proper failed to improve, newer waves followed them. The Armenians preserved their customs and traditions and established a number of prospering communities in the region, several of which survive to this day.

In an ethnic and national sense, the Crimea has been a host to wide group of peoples. Historians and other scholars have placed dated the Armenian presence in the Crimea to the 8th century and have distinguished three distinctive stages of their settlement in the region. The Crimea was under the control of the Byzantine Empire during this time and some Armenian troops serving in the Byzantine military were stationed here. In the course of the next two centuries, Armenians from their homelands in the Armenian Highlands and other Byzantine cities came to settle here as well.

Armenian people or Armenians (Armenian: հայեր, Armenian pronunciation: [hɑˈjɛɾ]) are a nation and ethnic group native to the Armenian Highland.

The largest concentration is in Armenia, having a nearly homogeneous population with 97.9% or 3,145,354 being ethnic Armenian. Because of wide-ranging and long-lasting diaspora, an estimated total of 3 million people of full or partial Armenian ancestry live outside of Armenia. As a result of the Armenian Genocide, a large number of survivors fled to many countries throughout the world, most notably the Russian Empire, the Near East, the United States, France, Iran, Georgia and other parts of Europe (see Armenian diaspora).

Christianity began to spread in Armenia soon after Jesus's death, due to the efforts of two of his apostles, St. Thaddeus and St. Bartholomew In the early 4th century, the Kingdom of Armenia became the first nation to adopt Christianity as a state religion. Most Armenians adhere to the Armenian Apostolic Church, a non-Chalcedonian church, which is also the world's oldest national church.

Crimean Tatars (sg. Qırımtatar, pl. Qırımtatarlar) or Crimeans (sg. Qırım, Qırımlı, pl. Qırımlar, Qırımlılar) are a Turkic ethnic group that originally resided in Crimea. They speak the Crimean Tatar language. They are not to be confused with the Volga Tatars.

In modern times, in addition to living in Crimea, Ukraine, there is a large diaspora of Crimean Tatars in Turkey, Romania, Bulgaria, Uzbekistan, Western Europe, the Middle East and North America, as well as small communities in Finland, Lithuania, Russia, Belarus and Poland. (See Crimean Tatar diaspora)

Today, more than 240,000 Crimean Tatars live in Crimea and about 150,000 remain in exile in Central Asia, mainly in Uzbekistan. There is an unspecified number of people of Crimean Tatar origin living in Turkey, descendants of those who emigrated in the 19th and early 20th centuries. In the Dobruja region straddling Romania and Bulgaria, there are more than 27,000 Crimean Tatars: 24,000 on the Romanian side, and 3,000 on the Bulgarian side^{[citation needed]}.