The Kasbah of the Udayas (Arabic: قصبة الأوداية), also spelled Kasbah of the Oudaias or of the Oudayas, is a kasbah (citadel) in Rabat, Morocco. It is located on a hill 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.