Galaxy-Class Starship

Star Trek: The Next Generation
Episode: TNG 101 - Encounter at Farpoint, Part I

The largest Starfleet vessel until the coming of the Sovereign-class, and its most-decked at 42.

Ships of the class include the namesake U.S.S. Galaxy and the U.S.S. Venture, as well as the destroyed U.S.S. Yamato, U.S.S. Odyssey, and U.S.S. Enterprise-D.