| CLEO | Chief Law Enforcement Officer 
| Others |
| CLEO | Climate Leadership Engagement Opportunities
| Others |
| CLEO | Clinical Learning Experience in Ophthalmoscopy
| Others |
| CLEO | Come Listen Every One
| Others |
| CLEO | Community Leadership Education and Outreach
| Others |
| CLEO | Community Legal Education Ontario
| Others |
| CLEO | Compact Library Extension Organizer
| Others |
| CLEO | Conference for Legal Education Opportunity
| Others |
| CLEO | Conference on Lasers and Electro-Optics
| Others |
| CLEO | Council on Legal Education Opportunity
| Others |
| CLEO | Creative Learning and Engagement Opportunities
| Others |
| CLEO | Cumbria and Lancashire Education Online
| Others |
| CLEO | Customized Learning Experiences On-Line
| Others |
| CLEO | European Conference on Lasers and Electro-Optics
| Others |