Mein Schiff 2 (My Ship 2) (formerly MV Mercury and Celebrity Mercury) is the second of two Century-class cruise ships operated by TUI Cruises. Built for Celebrity Cruises at the Meyer Werft shipyard in Papenburg, Germany, she was launched on 11 July 1997, and was christened and entered service as MV Mercury on 27 October 1997.
In 2008, after some eleven years in operation as Mercury, she was renamed Celebrity Mercury. In 2011, she was transferred to the fleet of TUI Cruises, a joint venture between TUI AG and Celebrity Cruises' owner Royal Caribbean Cruises Ltd. At the same time, she was renamed Mein Schiff 2. Her sister ship Mein Schiff 1 is the former MV Galaxy, also previously operated by Celebrity Cruises.