The Bay of Cádiz is a body of water adjacent to the southwestern coast of Spain. It touches the following municipalities in the province of Cádiz: Cádiz, San Fernando, Puerto Real, El Puerto de Santa Maria, and Rota. The Bay of Cádiz should not be confused with the Gulf of Cádiz, a larger body of water which is in the same area but further offshore.
Inside Bay of Cádiz is the Bahía de Cádiz Natural Park.
There is also a comarca (the Spanish equivalent of a county) with the name Bay of Cádiz.