The Greeks in Armenia , like the other groups of Caucasus Greeks such as the Greeks in Georgia, are mainly descendants of the Pontic Greeks, who originally lived along the shores of the Black Sea, in the uplands of the Pontic Alps, and other parts of northeastern Anatolia. In their original homelands these Greek communities are called Pontic Greeks and Eastern Anatolia Greeks respectively. Seafaring Ionian Greeks settled around the southern shores of the Black Sea starting around 800 BC, later expanding to coastal regions of modern Romania, Russia, Bulgaria and Ukraine. The Pontic Greeks lived for thousands of years almost isolated from the Greek peninsula, retaining elements of the Ancient Greek language and making Pontic Greek unintelligible to most other modern Hellenic languages. They were joined in the region by later waves of Greeks in the Hellenistic, Roman, and Byzantine period, ranging from traders, scholars, churchmen, mercenaries, or refugees from elsewhere in Anatolia or the southern Balkans.

The Caucasus Greeks, also known as the Greeks of Transcaucasia and Russian Asia Minor, are the ethnic Greeks of the North Caucasus and Transcaucasia in what is now southwestern Russia, Georgia, and northeastern Turkey. These specifically include the Pontic Greeks, though they today span a much wider region including the Russian north Caucasus, and the former Russian Caucasus provinces of the Batum Oblast' and the Kars Oblast', now in north-eastern Turkey and Adjara in Georgia.