Buthrotum was an ancient Greek and later Roman city and bishopric in Epirus.
In modern times it is an archeological site in Vlore County, Albania, some 14 kilometres south of Sarande and close to the Greek border and became a Latin Catholic titular see. It was known in antiquity as Βουθρωτόν (Bouthroton) or (Βουθρώτιος) Bouthrotios in Ancient Greek and Buthrotum in Latin. It is located on a hill overlooking the Vivari Channel and part of the Butrint National Park. Inhabited since prehistoric times, Buthrotum was a city of the Greek tribe of the Chaonians, later a Roman colony and a bishopric. It entered into decline in Late Antiquity, before being abandoned during the Middle Ages after a major earthquake flooded most of the city.