Sal Rei is a city on the northwestern coast of the island of Boa Vista in eastern Cape Verde. Sal Rei is the island's main urban settlement, and the seat of the Boa Vista Municipality. In 2010 its population was 5,778. The name of the settlement means "Salt King" in Portuguese. This name stems from when the island's main industry was salt production.
Sal Rei has a port on the bay with ferry routes to the islands of Santiago (Praia), Sal (Santa Maria) and Maio (Cidade do Maio). A new quay was built in 2015. West of the port lies the small islet of Ilhéu de Sal Rei. Tourism is concentrated on the area of Praia de Cabral.