Buthrotum (Albanian: Butrint; Ancient Greek: Βουθρωτόν, Vouthrotón; Latin: Buthrōtum) was an ancient Greek and later Roman city in Epirus. In modern times it is an archeological site in Sarandë District, Albania, some 14 kilometres south of Sarandë and close to the Greek border. 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 Epirote 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.

Bouthroton was originally a town within the ancient region of Epirus. It was one of the major centres of the Ancient Greek tribe of Chaonians, with close contacts to the Corinthian colony on Corfu. According to the Roman writer Virgil its legendary founder was the seer Helenus, a son of the king Priam of Troy, who had married Andromache and moved West after the fall of Troy. The Greek historian Dionysius of Halicarnassus, as does the Latin poet Virgil, wrote that Aeneas visited Bouthroton after his own escape from the destruction of Troy.