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 in 1977. Along with P&O Cruises Australia, another former subsidiary of P&O, it has the oldest heritage of any cruise line in the world, dating to P&O's first passenger operations in 1837.