"Long live the Empire!"
– Kor's last parting words, 2375

Dahar Master Kor, son of Rynar, was a male Klingon military officer and ambassador in the 23rd and 24th centuries. He was among the most influential warriors and respected military leaders of the Klingon Empire. In the United Federation of Planets, he was known chiefly as being partly responsible for the institution of the Treaty of Organia that ended war with the UFP, and for being an adversary of Starfleet Captain James T. Kirk and Chancellor Gowron and a friend of Kang, Koloth, Curzon, and later Jadzia Dax, as well as Worf, son of Mogh.

Kor was the last son of the House of Kor and descendant of the Klingon Imperial Family. He also had a son. He was descended from Klingons affected with the augment virus created in 2154, a product of 22nd century Klingon genetic engineering. By the 24th century, he was cosmetically indistinguishable from an average Klingon.

Throughout his illustrious career, Kor played key roles in many legendary battles against the Federation and Romulan Empire. Kor's influence in the Empire eventually elevated him to the status of Klingon Dahar Master.