Two ships of the Royal Navy have been named HMS Campania after the region of Campania in Italy:

• RMS Campania was a British ocean liner owned by the Cunard Steamship Line Shipping Company, launched in 1892. While awaiting demolition in 1914 the British Admiralty bought her to convert into an armed merchant cruiser that could carry seaplanes.
  • The first HMS Campania (1914), purchased in 1914, was the passenger liner RMS Campania converted to a seaplane tender. She collided with Royal Oak and Glorious in 1918 and sank in the Firth of Forth. The wreck-site was designated under the Protection of Wrecks Act on 1 December 2001.
• The second HMS Campania (D48) was an escort carrier launched in 1943. She served in World War II and was broken up in 1955.

• Colledge, J. J.; Warlow, Ben (2006) [1969]. Ships of the Royal Navy: The Complete Record of all Fighting Ships of the Royal Navy (Rev. ed.). London: Chatham Publishing. ISBN 978-1-86176-281-8.