CRO, Cro, or CrO may refer to:
- Cro (1993–1994), an American animated television series, or its titular character
- Cro, a concept in early Scots law described in the Leges inter Brettos et Scottos
- ČRo, station designator prefix used by the Czech public radio broadcaster Český Rozhlas
- Cathode-ray oscilloscope, a type of electronic test equipment
- IOC and FIFA country code for Croatia (the ISO 3166-1 code is HRV)
- Crown Airways, the ICAO code
- Conversion rate optimisation in internet marketing
- Cro (rapper), German rapper Carlo Waibel
In organisations
- Cave Rescue Organisation (f. 1935), an English emergency services organisation
- Civilian Repair Organisation, a WW2 British government aircraft repair scheme
- Companies Registration Office (Ireland), a government organisation in the Republic of Ireland
- Companies Registration Office (disambiguation)
- Contract research organization, a type of pharmaceutical industry organisation
In occupations
- Chief risk officer, a corporate executive title
- Chief research officer, a corporate title
- Combat Rescue Officer, a Commissioned Pararescuemen in the United States Air Force
- Certified Radio Operator, a professional title regulated by the Society of Broadcast Engineers
- Chief Restructuring Officer, corporate executive title
- Control Room Operator, a term used in the petroleum industry for the person operating the control room.
In chemistry
- Chromium(II) oxide, a metal oxide with Chromium in the +2 oxidation state