Diamond Princess is a British cruise ship owned and operated by Princess Cruises. It began operation in March 2004 and primarily cruises in Asia during the northern hemisphere summer and Australia during the southern hemisphere summer. It is a subclassed Grand-class ship, which is also known as a Gem-class ship.
In February 2020, 3,700 passengers and crew were quarantined by the Japanese Ministry of Health, Labour and Welfare off the Port of Yokohama due to passengers with COVID-19 infections. Passengers with confirmed cases were reported to be taken ashore for treatment.[