P&O Cruises is a British cruise line based at Carnival House in Southampton, England, operated by Carnival UK and owned by Carnival Corporation & Plc. It was originally a subsidiary of the shipping company P&O and was founded during a restructuring of P&O's operations in 1977.
Along with P&O Cruises Australia, a sister company also founded by P&O, it has the oldest heritage of any cruise line in the world, dating to P&O's first passenger operations in 1837
P&O Cruises was divested from P&O in 2000, becoming a subsidiary of P&O Princess Cruises before coming under its current ownership in 2003, following a merger between P&O Princess Cruises and Carnival Corporation.
In 2018, the company had a 2.4% market share of all cruise lines worldwide.