Several ships and shore establishments of the Royal Australian Navy have been named HMAS Platypus, after the platypus: , the former HMVS Cerberus. , a submarine depot ship built for the Royal Navy as HMS Penguin in 1917, transferred to the RAN in 1919 and scrapped in 1958. , a submarine shore base on Sydney Harbour between 1967 and 1999.
Battle honours Ships named HMAS Platypus are entitled to carry a single battle honour: Darwin 1942–43
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