| Acronym | Definition |
|---|
| ECAO➣Environmental Criteria and Assessment Office |
| ECAO➣Electrical Contractors Association of Ontario |
| ECAO➣Equipo de Consultoria en Agricultura Orgánica (Spanish: Consulting Team in Organic Agriculture) |
| ECAO➣Early Childhood Association of Oklahoma (Oklahoma City, OK) |
| ECAO➣Eastern Colorado Area Office (Loveland, CO) |
| ECAO➣Eritrean Canadian Association of Ontario (Toronto, Ontario, Canada) |
| ECAO➣Employees Compensation Assistance Ordinance (Labour Department; Hong Kong) |