The Álvaro de Bazán class (also known as the F100 class of frigates) are a new class of Aegis combat system-equipped air defence frigates entering service with the Spanish Navy. They are being built in the Spanish factory of Navantia in Ferrol and are named after Admiral Álvaro de Bazán.

The ships are fitted with American Aegis weapons technology allowing them to track hundreds of airborne targets simultaneously as part of its air defence network. The F100 Alvaro de Bazan class multi-role frigate is one of the few non-US warships to carry the Aegis Combat System and its associated AN/SPY-1 radar. Japan's Kongo-class, South Korea's King Sejong the Great-class, the F100-derived Norwegian Fridtjof Nansen-class of frigates also use the Aegis system. Lockheed Martin, Navantia and the U.S. Navy are conducting final systems integration.