RRC
- Mandaic manuscripts
- R2C (disambiguation)
- RC (disambiguation)
- Radio Resource Control
- Railroad Commission of Texas
- Range Resources
- Rbai Rafid Collection
- Reconstructionist Rabbinical College
- Regimental Reconnaissance Company
- Regional Radiocommunication Conference
- Relief and Rehabilitation Commission
- Road Runners Club (UK)
- Rolling resistance
- Roman Republican currency
- Root-raised-cosine filter
- Royal Red Cross
- Royal Regiment of Canada
- Royal Rifles of Canada
- Rubber Reserve Company