RK may stand for:
RKO Pictures Inc., also known as RKO Radio Pictures and in its later years RKO Teleradio Pictures, was an American film production and distribution company.
RK Zamet (Rukometni Klub Zamet) is a handball club from Rijeka, Croatia, formed in 1957. The club currently competes in the Croatian Premier Handball League and the Croatian Handball Cup.
RKO General, Inc. was the main holding company through 1991 for the noncore businesses of the General Tire and Rubber Company and, after General Tire's reorganization in the 1980s, GenCorp.
Rokometni Klub Gorenje Velenje (English: Gorenje Velenje Handball Club), commonly referred to as RK Gorenje or simply Gorenje, is a Slovenian handball club from Velenje.
Rokometni Klub Maribor Branik (English: Maribor Branik Handball Club), commonly referred to as RK Maribor Branik or simply Branik, is a handball club from Maribor, Slovenia.
The Novator RK-55 Relief (Russian: РК-55 Рельеф 'Relief'; NATO: SSC-X-4 'Slingshot'; GRAU: 3K12) is a Soviet land-based/submarine-launched cruise missile with a nuclear warhead.
RK Metalurg Skopje (HC Metalurg Skopje) (Macedonian: РК Металург Скопје) is a handball club from Skopje, Republic of Macedonia.