Sun Princess is a Sun class cruise ship built in 1995 and operated by the Princess Cruises line. At the time of her construction, she was one of the largest cruise ships in the world. She is the lead ship of her class that includes sister ships Dawn Princess, Sea Princess and the formerOcean Princess.

From November 2007, Sun Princess has been seasonally based at Sydney, Australia. Cruises offered from that time circumnavigationsAustralia, circumnavigations New Zealand,and visits to New Caledonia and Vanuatu.

Commencing from April 2008, Sun Princess will be permanently based in Australia operating out of Sydney during the Winter months, and from Melbourne during the Summer months. For the 2008/09 season the cruise program includes Australian circumnavigations, Fremantle - Malacca Straits return, Melbourne - New Zealand / South Pacific. She will also be sailing from Sydney as for Melbourne plus Whitsundays return, a Japan return itinerary, and an epic 75 night Grand Pacific trip. During Summer whilst Sun Princess is operating out of Melbourne, she will be joined by Dawn Princess operating out of Sydney. Dawn Princess will also be permanently based in Australia from this time which is a change from Princess' original plans.

Sun Princess was the ship on which the television show The Love Boat: The Next Wave starring Robert Urich was filmed. She made the news in October, 2007 as the largest ship to ever cross beneath the Sydney Harbor Bridge while entering the harbor for the first time, with a vertical clearance of approximately 2.5 meters to spare at low tide.