HMAS Melbourne (R21)
 HMAS Melbourne (R21) was a Majestic-class light aircraft carrier of the Royal Australian Navy (RAN). Operating from 1955 until 1982 she was the third and final conventional aircraft carrier to serve in the RAN. Melbourne was the only British Commonwealth naval vessel to sink two friendly warships in peacetime collisions.The ship was laid down for the Royal Navy as the lead ship of the Majestic class in April 1943 and was launched as HMS Majestic (R77) in February 1945.