Largest of Libya's three historic regions, occupying the eastern half of the country. Name derived from the ancient Greek city-state, Cyrene; in Arabic known as Barqu.

Cyrenaica or Cirenaica (Arabic: برقه, pronounced as: Barqah, see Barqah) is the eastern coastal region of Libya and also an ex Province or State ("muhafazah" or "wilayah") of the country (alongside Tripolitania and Fezzan) in an old system of administrative divisions which was abolished in the early 1970s in favour of a system of smaller-size municipality or "baladiyat" (singular "baladiyah"). The "Baladiyat"-system was subsequently changed many times and has lately become "Sha'biyat"-system. What used to be Cyrenaica in the old system is now divided up into several "Sha'biyat", see administrative divisions in Libya.