| CLO | Cali, Colombia 
| Others |
| CLO | Calibrated Lump Ore
| Others |
| CLO | Calontir Liberation Organization
| Others |
| CLO | Campylobacter Like Organism
| Others |
| CLO | Campylobacter-like organism test
| Others |
| CLO | Card Linked Offers
| Others |
| CLO | Cases Ladder Online
| Others |
| CLO | Cat Lovers Organization
| Others |
| CLO | Cell Line Ontology
| Others |
| CLO | Central Legal Office (National Health Service; UK)
| Others |
| CLO | Change Leader of
| Others |
| CLO | Chaphlobacter Like Organism
| Others |
| CLO | Chess Life Online
| Others |
| CLO | Chief Learning Officer
| Others |
| CLO | Chief Legal Officer
| Others |
| CLO | Chief lending officer
| Others |
| CLO | Chief Logistics Officer
| Others |
| CLO | Chlorine Monoxide
| Others |
| CLO | Civic Light Opera
| Others |
| CLO | Civic Light Opera (Pittsburgh, Pennsylvania)
| Others |
| CLO | Clarified Oil (fuel)
| Others |
| CLO | Clothing
| Others |
| CLO | Club Linux Outaouais
| Others |
| CLO | Club Lotus
| Others |
| CLO | Cod Liver Oil
| Others |
| CLO | Collateralised Loan Obligations
| Others |
| CLO | Collateralized Loan Obligation
| Others |
| CLO | Collateralized loan obligations
| Others |
| CLO | Color Light Output (projectors)
| Others |
| CLO | Colour Light Output
| Others |
| CLO | Command Line Options
| Others |
| CLO | Commercial Loan Origination
| Others |
| CLO | Commissariat aux Langues Officielles (Office of the Commissioner of Official Languages - Canada)
| Others |
| CLO | Commissioners of the Land Office
| Others |
| CLO | Community Leaders Organization
| Others |
| CLO | Community Liaison Office
| Others |
| CLO | Community Liaison Officer
| Others |
| CLO | Community Living Opportunities
| Others |
| CLO | Community Living Options
| Others |
| CLO | Competitive Life Opportunity
| Others |
| CLO | Compost-like Output
| Others |
| CLO | Computerized Loan Origination
| Others |
| CLO | Constant Light Output
| Others |
| CLO | Constrained Linear Ordination
| Others |
| CLO | Contact Lens Optician
| Others |
| CLO | Contact Loved Ones
| Others |
| CLO | Continental Liaison Office
| Others |
| CLO | Control Link Oscillator
| Others |
| CLO | Control Local Oscillator
| Others |
| CLO | Conversion Linked Optimisation
| Others |
| CLO | Copyright Licensing Organisation
| Others |
| CLO | Cornell Lab Of
| Others |
| CLO | Cornell Laboratory of Ornithology
| Others |
| CLO | Coroner's Liaison Officer
| Others |
| CLO | Corpers Liaison Officer
| Others |
| CLO | Course Learning Outcome
| Others |
| CLO | Court Liaison Officer
| Others |
| CLO | Hypochlorite
| Others |
| Clo. | Closet
| Others |