RK may stand for:
RKO Pictures is an American film production and distribution company. In its original incarnation, as RKO Radio Pictures, Inc.
The RKM code, also referred to as "letter and digit code for resistance and capacitance values and tolerances" or "R notation", is a notation to specify resistor and capacitor values defined in the international standard IEC 60062 (formerly IEC 62) since 1952. It is also adopted by various other standards including DIN 40825 (1973), BS 1852 (1974), IS 8186 (1976) and EN 60062 (1993).
RKO General, Inc. (previously General Teleradio, RKO Teleradio Pictures, & RKO Teleradio) was the main holding company from 1959 through 1991 for the noncore businesses of the General Tire and Rubber Company and, after General Tire's reorganization in the 1980s, GenCorp.
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.
The Novator RK-55 Relief (Russian: РК-55 Рельеф 'Relief'; NATO: SSC-X-4 'Slingshot'; GRAU: 3K12) is a Soviet land-based or submarine-launched cruise missile with a nuclear warhead.
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.