| Acronym | Definition |
|---|
| DCAO➣Departamento de Ciencias de la Atmósfera y los Océanos (Spanish: Department of Atmospheric and Oceanic Sciences; Argentina) |
| DCAO➣Debt Collection Assistance Officer (US DoD TRICARE) |
| DCAO➣Defence Counsel Association of Ottawa (Canada) |
| DCAO➣Deputy Chief Administrative Officer (various locations) |
| DCAO➣Digital Commerce Advancement Organization (financial technologies) |