Commander Kiff was a Klingon who served as an officer in the Klingon Imperial Fleet in the mid-23rd century.
During the Klingon War of 2256–57, Kiff was one of three warlords subordinate to General Dak'Rah on the contested moon of J'Gal. He and his fellows, General Gra'val and Captain Ruh'lis, supported the declaration of all those on J'Gal other than Klingon warriors to be enemies, which led to the massacre of civilians at Colony Athos. Starfleet special forces, led by Lieutenant Va'Al Trask, attempted but failed to assassinate the Klingon leadership on J'Gal. Before the Federation evacuated the moon, Doctor Joseph M'Benga undertook the mission personally and killed Kiff with a d'k tahg.
In 2259, Dak'Rah told M'Benga that Kiff had fought the hardest of the three warlords. M'Benga later corrected him that Ruh'lis had actually fought the hardest, since he had actually been the one to kill them and not Dak'Rah as history recorded. Kiff's blood still remained on the blade in M'Benga's possession. (SNW: "Under the Cloak of War")
Kiff was played by an unknown actor.