Arvanites are a population group in Greece of Albanian origin. They are bilingual, traditionally speaking Arvanitika, an Albanian language variety, along with Greek. Their ancestors were first recorded as settlers who came to what is today southern Greece in the late 13th and early 14th century. They were the dominant population element in parts of the Peloponnese, Attica and Boeotia until the 19th century. They call themselves Arvanites and Arbëror. Arvanites today self-identify as Greeks as a result of a process of cultural assimilation, and do not consider themselves Albanian. Arvanitika is in a state of attrition due to language shift towards Greek and large-scale internal migration to the cities and subsequent intermingling of the population during the 20th century.

Arvanitika, also known as Arvanitic, is the variety of Albanian traditionally spoken by the Arvanites, a population group in Greece. Arvanitika was brought to southern Greece during the late Middle Ages by Albanian settlers who moved south from their homeland in present-day Albania in several waves. The dialect preserves elements of medieval Albanian, while also being significantly influenced by the Greek language. Arvanitika is today endangered, as its speakers have been shifting to the use of Greek and most younger members of the community no longer speak it.