Kor or KOR may refer to:

• Kör, the bed belonging to Hel, queen of the underworld in Norse mythology
• Kor River, an river in the Fars, Iran
• Kor, East Azerbaijan, a village in Iran
• Kor-e Olya, a village in East Azerbaijan Province, Iran
• Kor-e Sofla, a village in East Azerbaijan Province, Iran
• Kor, Khuzestan, a village in Iran
• Korean language, the official language of South Korea and North Korea
• Homer (unit), an ancient Hebrew unit of capacity equal to 10 baths or 10 ephahs
• King of the Ring, a tournament of World Wrestling Entertainment
• Komitet Obrony Robotników (Workers' Defence Committee), a Polish civil society group
• κ-opioid receptor, a human protein
• North Korea, officially known as Democratic People's Republic of Korea (DPRK)
• South Korea, officially known as the Republic of Korea (ROK)

In Norse mythology, Hel is a being who presides over a realm of the same name, where she receives a portion of the dead. Hel is attested in the Poetic Edda, compiled in the 13th century from earlier traditional sources, and the Prose Edda, written in the 13th century by Snorri Sturluson. In addition, she is mentioned in poems recorded in Heimskringla and Egils saga that date from the 9th and 10th centuries, respectively. An episode in the Latin work Gesta Danorum, written in the 12th century by Saxo Grammaticus, is generally considered to refer to Hel, and Hel may appear on various Migration Period bracteates.

In J. R. R. Tolkien's legendarium, Tirion upon Túna was the city of the Noldor (and earlier, the Vanyar, who later moved into Valinor's interior) in Valinor. It was here that Finwë ruled from, and where his sons Fëanor, Fingolfin and Finarfin lived.