CRO
- Cave Rescue Organisation
- Certified Radio Operator (United States)
- Chief reputation officer
- Chief research officer
- Chief restructuring officer
- Chief revenue officer
- Chief risk officer
- Chromate and dichromate
- Chromium(II) oxide
- Civil restraint order
- Civilian Repair Organisation
- Combat Rescue Officer
- Commonwealth Relations Office
- Companies Registration Office (Ireland)
- Companies Registration Office (disambiguation)
- Contract research organization
- Conversion optimization
- Conversion rate optimization
- Credit Repair Organizations Act
- Cro (TV series)
- Cro (musician)
- Cro-Magnon
- Croatia
- Crow (disambiguation)
- Crown Airways
- Lambda phage
- Leges inter Brettos et Scottos
- Český Rozhlas