Explorer of the Seas is a Voyager-class cruise ship owned and operated by Royal Caribbean International, completed in 2000. She can accommodate over 3,000 guests, including scientists making use of a built-in atmospheric and oceanographic laboratory operated by the University of Miami's Rosenstiel School of Marine, Atmospheric, and Earth Science. The lab, with its attendant educational and outreach programs for passengers, was discontinued in 2007.

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.