The Albanoi (Ancient Greek: Ἀλβανοί, Albanoi; Latin: Albani) were an Illyrian tribe. They were possibly first mentioned by Hecataeus of Miletus (550-476 BCE) under the name Abroi. Ptolemy (100–170 CE) is the first author who mentions them under the name Albanoi. Their central settlement was called Albanopolis (Ἀλβανόπολις) and was located roughly between the Mat and Shkumbin rivers, in central Albania. The archaeological site of Zgërdhesh has been identified as the likely location of Albanopolis. Stephanus of Byzantium who reproduced Hecataeus added an entry for another settlement named Arbon in Illyria whose inhabitants were called Arbonioi or Arbonites. Another Arbon was recorded by Polybius. John of Nikiû wrote in the 7th century CE about a people known as Arbanitai in the Greek translation of the manuscript.
In the Middle Ages, the names Albanoi and Arbanitai/Albanitai referred to medieval Albanians as an ethnic group. The equivalent terms in Latin are Albanenses/Arbanenses, in Slavic Arbanasi and later in Turkish Arnaut. These names reflect the Albanian ethnic endonym Arbëreshë/Arbëneshë, which itself derives from Albanoi. In the archaeological record, the Albanoi are mentioned on a funeral inscription in Stobi and Albanopolis is mentioned on another funeral inscription near Scupi. Another ethnonym, Arbaios found in Phoenice is likely linked to them.