Sidi Raïs is a village and locality on Cape Bon in Tunisia.
It is located on the Gulf of Tunis ( خليج تونس ) and is notable as the last place that the Posidonia oceanica a marine phanerogam persists on the surface of the water (so-called "reef" form). It is near the bath town of Korbous. Surrounded by the Qorbus Forest and beaches of the Mediteranian, the area has been popular as a health resort for residents of Carthage since Roman times, and extensive ruins can be found to the north near Korbous.