The Kasbah of the Udayas, also spelled Kasbah of the Oudaias or of the Oudayas, is a kasbah in Rabat, Morocco. It is located on a hill at the mouth of the Bou Regreg opposite Salé, and adjacent to the Medina quarter of Rabat. It is listed, along with other sites in Rabat, as a UNESCO World Heritage Site.