| Acronym | Definition |
|---|
| CSEO | Cyprus Space Exploration Organisation |
| CSEO | Certified Senior Escrow Officer (finance) |
| CSEO | Centro Studi Europa Orientale (Italian: Study Center Eastern Europe) |
| CSEO | Child Support Enforcement Office (various locations) |
| CSEO | Corporation des Services en Éducation de l'Ontario (French: Education Services Corporation of Ontario; Ontario, Canada) |
| CSEO | Combat Systems Engineering Officer (Canadian Navy) |
| CSEO | Carolina Search Engine Optimization (South Carolina) |
| CSEO | Comparison Shopping Engine Optimization |