| Acronym | Definition |
|---|
| CLEO | Community Legal Education Ontario (legal aid clinic) |
| CLEO | Compact Library Extension Organizer (Firefox add-on) |
| CLEO | Council on Legal Education Opportunity |
| CLEO | Cumbria and Lancashire Education Online |
| CLEO | Chief Law Enforcement Officer |
| CLEO | Conference On Lasers and Electrooptics |
| CLEO | Chief Local Elected Official (various locations) |
| CLEO | Customized Learning Experience Online (Carnegie Mellon University) |
| CLEO | Clear Language for Expressing Orders (computer language) |
| CLEO | Center in Law, Economics and Organization |
| CLEO | Computer Listings of Employment Opportunities (est. 1984; Torrance, CA) |
| CLEO | Classified Energy Online |
| CLEO | Come Listen Every One (Korean pop group) |
| CLEO | Centrum voor Landbouw-Economisch Onderzoek (Dutch: Center for Agriculture-Economic Research) |