Several ships and shore establishments of the Royal Australian Navy have been named HMAS Platypus, after the platypus:

• HMAS Platypus (1868), the former HMVS Cerberus.
• HMAS Platypus (1917), a submarine depot ship built for the Royal Navy as HMS Penguin in 1917, transferred to the RAN in 1919 and scrapped in 1958.
• HMAS Platypus (naval base), a submarine shore base on Sydney Harbour between 1967 and 1999.

Ships named HMAS Platypus are entitled to carry a single battle honour:^[1][2]

• Darwin 1942–43

List of ships with the same or similar names

This article includes a list of ships with the same or similar names. If an internal link for a specific ship led you here, you may wish to change the link to point directly to the intended ship article, if one exists.