Greek Muslims, also known as Grecophone Muslims, are Muslims of Greek ethnic origin whose adoption of Islam (and often the Turkish language and identity in more recent times) dates either from the contact of early Islamic caliphates with the Byzantine Empire or to the period of Ottoman rule in the southern Balkans and Anatolia. In more recent times, they consist primarily of descendants of Ottoman-era converts to Islam from Greek Macedonia (e.g., Vallahades), Crete (Cretan Muslims), and northeastern Anatolia (particularly in the regions of Trabzon, Gümüşhane, Sivas, Erzincan, Erzurum, and Kars).
Despite their ethnic Greek origin, the contemporary Grecophone Muslims of Turkey have been steadily assimilated into the Turkish-speaking Muslim population. Sizable numbers of Grecophone Muslims, not merely the elders but even young people, have retained knowledge of their respective Greek dialects, such as Cretan and Pontic Greek. Because of their gradual Turkification, as well as the close association of Greece and Greeks with Orthodox Christianity and their perceived status as a historic, military threat to the Turkish Republic, very few are likely to call themselves Greek Muslims. In Greece, Greek-speaking Muslims are not usually considered as forming part of the Greek nation.