Ocean Princess formerly R Four and Tahitian Princess is an R-class cruise ship owned by Princess Cruises. She mainly sails around the French Polynesian islands Society Islands Cook Islands Marquesas Islands and often sails to Hawaii. She also spends northern hemisphere summers in Alaska. Her sister ships are Pacific Princess and Royal Princess. In November 2009 the Tahitian Princess was renamed Ocean Princess to reflect a more global theme.
Builders of the Ocean Princess (ship) are Chantiers de l'Atlantique, France and Saint-Nazaire.