Vagenetia or Vagenitia (Greek: Βαγενετία, Βαγενιτία) was a medieval region on the coast of Epirus, roughly corresponding to modern Thesprotia. The region likely derived its name from the Slavic tribe of the Baiounitai. It is first attested as a sclavinia under some sort of Byzantine control in the 8th/9th centuries. It passed under Bulgarian rule in the late 9th century, and returned to Byzantine rule in the 11th. It passed to the Despotate of Epirus after 1204, where it formed a separate province. Vagenetia came under Albanian rule in the 1360s, until conquered by the Ottoman Empire in 1430.