HMS Eagle was an Audacious-class aircraft carrier of the Royal Navy, in service 1951–1972. Until the arrival of the Queen Elizabeth-class aircraft carriers in the 21st century, she and her sister Ark Royal were the two largest Royal Navy aircraft carriers ever built.

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.