| CRO | Cancel Rerouted Overflow 
| Others |
| CRO | Canceling Returns Only
| Others |
| CRO | Car Rental Operator
| Others |
| CRO | Carbapenem Resistant Organisms
| Others |
| CRO | Carded for Record Only
| Others |
| CRO | Cathode Ray Oscillograph
| Others |
| CRO | Cathode Ray Oscilloscope
| Others |
| CRO | Cathode-Ray Oscilloscope
| Others |
| CRO | Cave Rescue Organisation
| Others |
| CRO | Cave Rescue Organization
| Others |
| CRO | Center for Radiation Oncology
| Others |
| CRO | Center Rotate Offset
| Others |
| CRO | Central Reservation Office
| Others |
| CRO | Central Reservations Office
| Others |
| CRO | Certified Radio Operator
| Others |
| CRO | Cessation of Regulated Operations
| Others |
| CRO | Cetos Research Organization (Bar Harbor, ME)
| Others |
| CRO | Change of Reporting Official
| Others |
| CRO | Chapter Relations Office
| Others |
| CRO | Character Relationships Objective
| Others |
| CRO | Chief Range Officer
| Others |
| CRO | Chief Recognition Officer
| Others |
| CRO | Chief Registration Officer
| Others |
| CRO | Chief Regulatory Officers
| Others |
| CRO | Chief Requisition Offcier
| Others |
| CRO | Chief Research Officer
| Others |
| CRO | Chief Restructuring Officer
| Others |
| CRO | Chief Returning Officer
| Others |
| CRO | Chief Revenue Officer
| Others |
| CRO | Chief Risk Officer
| Others |
| CRO | Child Restoration Outreach
| Others |
| CrO | Chromium(II) Oxide
| Others |
| CRO | Chrono Revolution Omega
| Others |
| CRO | Church-Related Organization
| Others |
| CRO | Civil Rights Officer
| Others |
| CRO | Civilian Repair Organisation
| Others |
| CRO | Classes Reunion Organization
| Others |
| CRO | Classique Rallye Organisation (French car club)
| Others |
| CRO | Click Rate Optimization
| Others |
| CRO | Clinical Research Office
| Others |
| CRO | Clinical Research Officer
| Others |
| CRO | Clinical Research Organization
| Others |
| CRO | Clock Reference Oscillator (AT&T)
| Others |
| CRO | Club Race Officer
| Others |
| CRO | Codice di Riferimento dell'Operazione (Italian: bank money transfer)
| Others |
| CRO | Cognizant Regional Office
| Others |
| CRO | Collection and Recycling Organisation
| Others |
| CRO | Colorado Recorder Orchestra
| Others |
| CRO | Coloured Roads Only
| Others |
| CRO | Columbia Recovery Office
| Others |
| CRO | Combat Rescue Officer
| Others |
| CRO | Commonwealth Relations Office
| Others |
| CRO | Community Redevelopment Office
| Others |
| CRO | Community Rehabilitation Orders
| Others |
| CRO | Community Relations Office
| Others |
| CRO | Community Resource Officer
| Others |
| CRO | Community Reuse Organization
| Others |
| CRO | Companies Registration Office
| Others |
| CRO | Company Relation Officer
| Others |
| CRO | Competitor Relations Officer
| Others |
| CRO | Complaint Resolution Official
| Others |
| CRO | Complaints Resolution Officer
| Others |
| CRO | Complaints Resolution Official
| Others |
| CRO | Component Repair and Overhaul
| Others |
| CRO | Congressional Relations Officer
| Others |
| CRO | Consolidated Restaurant Operations
| Others |
| CRO | Construction Related Occupation
| Others |
| CRO | Container Release Order
| Others |
| CRO | Continuity Recheck Outgoing
| Others |
| CRO | Contract Regulatory Organization
| Others |
| CRO | Contract Research Organisation
| Others |
| CRO | Contract Research Organization
| Others |
| CRO | Contract Research Organizations
| Others |
| CRO | Control Room Operator
| Others |
| CRO | Conversation Rate Optimisation
| Others |
| CRO | Conversation Rate Optimization
| Others |
| CRO | Conversion Rate Optimisation
| Others |
| CRO | Conversion Rate Optimization
| Others |
| CRO | Corporate Reservations Office
| Others |
| CRO | Corporate Responsibility Officer
| Others |
| CRO | Costa Rican Outpost
| Others |
| CRO | Counterfeit Resistant Option
| Others |
| CRO | County Records Office
| Others |
| CRO | Course Resources Online
| Others |
| CRO | Creative Roleplaying Organization (live action roleplaying games)
| Others |
| CRO | Credited Retail Outlet
| Others |
| CRO | Crisis Response Operation
| Others |
| CRO | Crisis Response Operations
| Others |
| CRO | Criterion Reference Objective
| Others |
| CRO | Croatia
| Others |
| CRO | Croatian
| Others |
| CRO | Crown Pacific Partners, L. P.
| Others |
| CRO | CSU Research Output
| Others |
| CRO | Current Ray Oscillator
| Others |
| CRO | Customer Record Output
| Others |
| CRO | Customer Relationship Officer
| Others |
| CRO | Customer Relationship Optimization
| Others |
| CRO | Customer Revenue Optimizer
| Others |