The Kasbah of the Udayas (Arabic: قصبة الأوداية Qasbat al-Awdāya, also الوداية al-Widaya) (also spelled "Oudaias" or "Oudayas") is a kasbah (citadel) in Rabat, Morocco. It is located at the mouth of the Bou Regreg river, opposite Salé, and adjacent to the old medina of Rabat. It is listed, along with other sites in Rabat, as a UNESCO World Heritage Site.