Turco-Albanian (Greek: Τουρκαλβανοί, Tourk-alvanoi) is an ethnographic and religious term used by Greeks for Muslim Albanians from 1715 and thereafter. In a broader sense, the term included both Muslim Albanian and Turkish elites and military units of the Ottoman administration in the Balkans. The term is derived from an identification of Muslims with Ottomans and/or Turks, due to the Ottoman Empire's administrative millet system of classifying peoples according to religion. From the middle of the nineteenth century, the term Turk and from the late nineteenth century onwards, the derivative term Turco-Albanian has been used as a pejorative term, phrase and or expression for Muslim Albanian individuals and communities. The term has also been noted to be unclear, ideologically and sentimentally charged, and an imperialist and racialist expression. Albanians have expressed derision and disassociation toward the terms Turk and its derivative form Turco-Albanian regarding the usage of those terms in reference to them.
The term Turco-Albanian is a compound made up of the words Turk and Albanian. The word Albanian was and still is a term used as an ethnonym. Whereas the word Turk was viewed at times by Western Europeans or by non Muslim Balkan peoples as being synonymous with Muslim. Apart from being associated with Muslim Albanians, in some specific works the term Turco-Albanian was used to mention the Labs (Greek: Liapides), a socio-cultural and dialectal Albanian subdivision, some of whom had converted to Islam during the Ottoman Empire era.
In a broader sense the term Turco-Albanian was used to denote Ottoman military units and elites of both Turkish and Albanian ethnicity that represented the Ottoman administration of the Balkans. Within the Ottoman Empire, Muslim Albanians were closely part of the administrative structures of the state and considered one of its important peoples.
Reference to Muslim Albanian communities as Turco-Albanian is made for those that settled the Peloponnese in order to spread Islam from c. 1715 until after 1770, as part of official Ottoman policy. Later in 1770, Muslim Albanian mercenaries referred to by Greeks as Turco-Albanian were employed by the Ottoman Sultan to suppress the Greek uprising. Their activity included massacres, looting and destruction in the regions of Epirus, Western Macedonia, Central Greece, Thessaly, Peloponnese suffered most destruction and massacre due to the activity of 15,000 Muslim Albanian mercenaries. In 1779 the Ottoman army finally managed to drive those groups out of Peloponnese, while the remaining ones were either killed by local villagers or found refuge in Muslim Albanian communities in Lala and Vardounia. The period of 1770-1779 is generally termed as Alvanokratia (Albanian rule) in Greek historiography. As a result, local Greek traditions in Epirus since the late 18th century mention frequent raids and looting by "Turko-Albanians" or "Albanian" bands. This kind of activity was connected with the depopulation of settlements.