GTS Celebrity Constellation is a Millennium-class cruise ship of Celebrity Cruises. She was originally named Constellation, but renamed in May 2007. Her three sister ships are the Celebrity Infinity, Celebrity Summit, and Celebrity Millennium.

She was built at the Chantiers de l'Atlantique shipyard in St. Nazaire, France. The ship is powered by a COGES power plant of gas turbines and a steam turbine providing up to 60 megawatts for the electric systems and two 19 MW Rolls-Royce/Alstom MerMaid azimuth thrusters for propulsion. In 2007, an additional diesel engine was fitted as a fuel-saving measure. The ship can run on any combination of the gas turbines or diesel. In port, she generates electrical power from the diesel.

During the summer period the ship sails to the Mediterranean, repositioning to the Caribbean in the winter months.

Routes

Celebrity Constellation currently operates in the Mediterranean and Adriatic during the summer seasons and in the Persian Gulf during the rest of the calendar year. In October 2020, she will reposition to Tampa, Florida to cruise the Caribbean and the Panama Canal, the first time Celebrity has operated out of Tampa in 13 years.