Périgueux (/ˌpɛrɪˈɡɜː/, French: [peʁiɡø]; Occitan: Peireguers [pejɾeˈɣɥes; pejɾeˈɡœː] or Periguers [peɾiˈɣɥes; peɾiˈɡœː]) is a commune in the Dordogne department, in the administrative region of Nouvelle-Aquitaine, southwestern France. Périgueux is the prefecture of Dordogne, and the capital city of Périgord. It is also the seat of a Roman Catholic diocese.