Two ships of the Royal Australian Navy have borne the name Adelaide, the capital city of South Australia.
The first HMAS Adelaide was a Chatham class light cruiser laid down by HMA Naval Dockyard at Cockatoo Island in Sydney on 20 November 1915 and launched on 27 July 1918 by Lady Helen Munro Ferbuson, the wife of the Governor-General. Fitting out and completion were delayed due to the loss by enemy action of important machinery parts which gave rise to the nickname Long Delayed. The ship was completed on 31 July 1922 and commissioned on 5 August 1922. HMAS Adelaide paid off on 13 May 1946 and was sold to Australian Iron and Steel Pty Ltd on 24 January 1949. On 1 April 1949 the hulk was towed to Port Kembla in New South Wales and broken up.
The second HMAS Adelaide (01) is an Oliver Hazard Perry class guided missile armed frigate laid down by Todd-Pacific Shipbuilding at Seattle in Washington on 29 July 1977, launched on 21 June 1978 and commissioned on 15 November 1980. HMAS Adelaide is an active unit of the Royal Australian Navy.