RBK may refer to:
- Reebok, a company specializing in sportswear and goods, or a brand of sportswear made by Reebok.
- Rockbank railway station, Melbourne
- Rosenborg BK (Rosenborg Ballklub), a Norwegian football club
- Royal Borough of Kingston upon Thames, in Greater London
- Rögle BK (Rögle Bandyklubb), an ice hockey club from Sweden
- Rheinisch-Bergischer Kreis, a district of North Rhine-Westphalia in Germany
- RBK-250, a Soviet-era cluster bomb
- RBK-500, a Soviet-era cluster bomb
- RBK Group, a Russian media group
- IATA airport code for French Valley Airport