The USS Ambassador (NX-10521, later NCC-10521) was a Ambassador-class heavy cruiser in service to Starfleet in the early 24th century. When she was commissioned in 2325, the Ambassador was the prototype for a new class of heavy cruisers. (TNG reference: Star Trek: The Next Generation Technical Manual, Decipher RPG modules: Starfleet Operations Manual, Starships)

The Ambassador experienced its first test-bed trials at Helaspont Station near Tzenkethi space in 2319[1], supervised by Starfleet Admirals Los Tirasol Mentir and John Harriman, ostensibly as an intimidation-tactic against the volatile Tzenkethi Coalition. (ST - The Lost Era novel: One Constant Star, ST video game: Starship Creator) During her field trials, the Ambassador visited an unnamed planetary system. (ST calendar: Ships of the Line 2012)

In 2333, the Ambassador was a test bed for new technologies while NX-10521 and was operating out of Utopia Planitia Fleet Yards. (STA novel: Enigma; TNG reference: Star Trek: The Next Generation Technical Manual) The Ambassador was later given operational status with the NCC registry number. (ST reference: Star Trek Encyclopedia)



Ambassador-class explorer/heavy cruiser starships
Ufp-emblem AdelphiAmbassadorAssuranceAuroraAyersChamplinCrescentCybeleEnterprise-CExcaliburExeterFuryGandhiGravinaHammarskjöldHannibalHardingHawkesburyHickokHoratioIndependenceIroquoisIsisKadoscaKrotusLoma PrietaMacDonaldMadisonManassasMonroeMontgomeryNormanQuiberonSeattleSheltonStrongThelianThornValdemarVelascoWarakurnaWilsonWinslowYamaguchiZarnitzaZhukov

Yamaguchi-subclass: Yamaguchi

Starfleet Command logo


  1. The video game Bridge Commander and the Ships of the Line 2012 calendar give 2325 as the date this class entered service while the Last Unicorn RPG gives a date of 2322.

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