Périgueux (French pronunciation: [peʁiɡø]; Occitan: Peireguers [pejɾeˈɣɥes, pejɾeˈɡœː] or Periguers [peɾiˈɣɥes, peɾiˈɡœː]) is a commune in the Dordogne department in Aquitaine in southwestern France.Périgueux is the prefecture of the départment. It is also the seat of a Roman Catholic diocese.