| Acronym | Definition |
|---|
| PECO | Países da Europa Central e Oriental (Portugal) |
| PECO | Pays d'Europe Centrale et Orientale (French: Countries of Central and Eastern Europe) |
| PECO | Philadelphia Electric Company |
| PECO | Public Education Capital Outlay |
| PECO | Pelagic Cormorant (phalacrocorax pelagicus) |
| PECO | Pecos National Historic Park (US National Park Service) |
| PECO | Polyethoxylated Castor Oil (surfactant) |
| PECO | Pakistan Engineering Company Ltd. |
| PECO | Power, Ease-Of-Use, Compatibility, Overall Use |
| PECO | Processing and Exploitation Coordination Office |