The T-class was an Orion starship class, a type of destroyer in Orion fleet service during the 2270s decade.

In 2275, the T-class destroyer Umyfymu engaged the USS Enterprise in combat and was forced to retreat to Orion space. (TOS novel: Death Count)

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Starship classes of the Orions
By name	Brigand (cruiser) • Corsair (flight-deck cruiser) • Cutpurse • D'Var • Dacoit • Dwarfstar • Harmony • Lightning • Maraar • Marauder • Orchid • Slavemaster • Stiletto • Swift Solaria • Suga • Wanderer • Warbarge
By type	Orion corvette (corvette-III class • corvette-IV class) • Orion interceptor • Orion marauder • Orion pirate ship • Orion pleasure barge • Orion raider • Orion salvage cruiser • Orion scout ship • Orion slaver
Mirror universe	Brigand (mirror) • Corsair (fighter)