Sun Princess is a Sphere-class cruise ship operated by Princess Cruises, a subsidiary of Carnival Corporation & plc, and is the third ship to sail for the cruise line under this name. Sun Princess was ordered on 23 July 2018 from Fincantieri and were constructed at the Fincantieri shipyard in Monfalcone, Italy, and debuted in 2024.

The final contract of the first two Sphere-class vessels was signed in March 2019. In March 2023, the ship was floated out in Monfalcone, Italy.^[7] Sun Princess was seen completing her sea trials in November 2023 and January 2024. Two weeks before her originally expected delivery, a mutual agreement to delay her delivery was announced. The circumstances were not explained. Sun Princess's debut was delayed from 8 February to 28 February 2024.^[8][9]

She had her naming ceremony in the Port of Barcelona being named by Hannah Waddingham on 23 April 2024.^[10] The Ted Lasso actress would later participate in an ad campaign where she performs the theme to The Love Boat television series aboard the ship.^[11]

Sun Princess sailed her maiden voyage on 28 February 2024, 20 days after her anticipated debut, setting sail in the Mediterranean.^[12]

Sun Princess is the first ship of the Sphere class. She measures 1,133 feet (345 m) in length with a beam of 155 feet (47 m). The Sphere class has been a major update to the overall design of Princess's ships, featuring a more modern look. Sun Princess also features new glass, dome-like elements visible from the exterior of the vessel.^[13][14] Sun Princess is the first Princess ship to be fueled by liquefied natural gas (LNG) which will persist throughout the Sphere class.