The Quundar was a Klingon Bird-of-Prey in service in the 23rd century.
In 2264, the Klingon rebel Koronin won the ship by killing its previous captain. She subsequently renamed the ship Quundar. Koronin then took the Quundar on a mission into the Federation Phalanx to attack the USS Enterprise. However, the attack was halted when they discovered that the Enterprise had encountered an alien generation ship. A peace agreement was made and the Quundar's crew were entertained by Amelinda Lukarian and her Warp-Speed Classic Vaudeville Company. (TOS novel: Enterprise: The First Adventure)