The Audacious-class aircraft carriers were a class of aircraft carriers proposed by the British government in the 1930s - 1940s and completed after the Second World War. The two ships built were heavily modified and diverged over their service lives. They were in operation from 1951 until 1979.

The Implacable-class aircraft carrier consisted of two aircraft carriers built for the Royal Navy during World War II. Derived from the design of the Illustrious class, they were faster and carried more aircraft than the older ships. They were initially assigned to the Home Fleet when completed in 1944 and attacked targets in Norway as well as the German battleship Tirpitz. Subsequently, they were assigned to the British Pacific Fleet (BPF).