RGK may refer to:
- RGK Foundation
- RGK Mobile
- RGK color space, see RG color space
- Red Wing Regional Airport (FAA Code: RGK)
- Gorno-Altaysk Airport (IATA Code: RGK)
- Romano-Germanic Commission (Römisch-Germanische Kommission), a department of the German Archaeological Institute
- RGK Entertainment Group
- RGK Wheelchairs