The Voyager class refers to a design of post-Panamax cruise ships owned and operated by Royal Caribbean International. The Voyager-class ships were built at Kværner Masa-Yards Turku New Shipyard, Finland.

There are two generations of Voyager-class ship which feature slight differences in design. The first generation ships, Voyager of the Seas, Explorer of the Seas and Adventure of the Seas, were launched between 1999 and 2001. The second generation ships Navigator of the Seas and Mariner of the Seas were launched in 2002 and 2003 respectively.^[1]

The Voyager class was named Project Eagle prior to launch. The project begain in 1995 after a series of marketing studies. Eagle aimed to attract cruisers who did not consider themselves "cruise ship people".^[2]

Voyager of the Seas was the first of Royal Caribbean's ships to feature a large open space in the centre of the ship known as the Royal Promenade, which has become a staple of future Royal Caribbean International ships, as well as being adopted by other cruise lines in various forms. The Royal Promenade was inspired by Harri Kulovaara, who was VP of Quality Assurance at RCI in the 1990s, who designed a similar feature on a Silja Lines ferry.^[2]

Voyager-class ships have a diesel-electric powertrain. They are powered by six Wärtsilä 46 diesel engines, giving a total output of 75,600 kilowatts (101,400 hp).^[3] The generated electric power supplies power to the 14 megawatt ABB Azipod azimuth thrusters (two steerable and one fixed).^[3]

The Voyager class featured some world firsts for cruise ships when it debuted, including the first rock climbing wall^[4] (mounted on the funnel) and ice-skating rink at sea.

The class' architecture was assigned to different architects and firms, some of which had no previous cruise ship experience. For example, the 1,350-seat La Scala Theatre on Voyager of the seas was designed by architect Wilson Butler Lodge, inspired by the Milan Opera House and bringing cruise-first features of Broadway theatres. This is the first time Royal Caribbean used theatre planning and design consultants for its onboard theatres.^[5]

In 2012, Mariner of the Seas was modified to include an outdoor movie screen and new passenger lounges. These same changes were made to Adventure of the Seas in 2014. Navigator of the Seas, Voyager of the Seas, and Explorer of the Seas replaced their inline skating tracks with Flowrider surf simulators in 2014 and 2015.^[6]