HMS Ocean (L12) of the Royal Navy is an Amphibious assault ship (or Landing Platform Helicopter), the sole member of her class. She is designed to support amphibious landing operations and to support the staff of Commander UK Amphibious Force and Commander UK Landing Force.
- While Ocean was undertaking the warm water element of her first-of-class trials, she provided humanitarian assistance in Honduras following Hurricane Mitch.
- During 2002 Ocean supported Operation Palliser in Sierra Leone, joining HMS Illustrious aiding the suppression of rebel activity with her own EMF and providing support facilities for the Spearhead battalion ashore.
- Ocean was part of a large Royal Navy task force deployed for Operation Telic, the UK contribution to the 2003 Iraq War. In the helicopter assault role she was accompanied by HMS Ark Royal.
- In the summer of 2006, she was deployed as part of the task force involved in the Aurora exercises on the eastern seaboard of the United States.
- In 2007, Ocean began her first long refit period. This was carried out by Devonport Management Limited at their Devonport Royal Dockyard facility and lasted around 12 months, during which period, Ark Royal took over the LPH role.
- HMS Ocean sailed from Plymouth on Wednesday 24 September 2008 to start sea trials, following this major period of maintenance and upgrading work.
- On 18 February 2009, Ocean sailed from Devonport as part of the Taurus 09 deployent under Commander UK Amphibious Task Group, Commodore Peter Hudson, She is joined on this deployment by Landing Platform Dock HMS Bulwark, as Hudson's flagship, Type 23 Frigates HMS Argyll and HMS Somerset and four ships of the Royal Fleet Auxiliary.