HMS Ocean (L12) of the Royal Navy is an Amphibious assault ship (or Landing Platform Helicopter) (or Helicopter carrier), 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. She is currently the largest ship in the Royal Navy.
She was constructed in the mid 1990s by Kvaerner Govan Ltd on the Clyde and fitted out by VSEL at Barrow-in-Furness prior to first of class trials and subsequent acceptance in service. She was commissioned in September 1998 at her home port Devonport, Plymouth, Devon.
HMS Ocean returned from her 27,000 mile (43,500 km) TAURUS 09 deployment to the Far East on 3 August 2009. She is currently involved in Exercise Auriga 2010 in North Atlantic and Eastern seaboard of the USA.