CTAO
| Acronym | Definition |
|---|---|
| CTAO | Coming Together as One |
| CTAO | Cherenkov Telescope Array Observatory (gamma ray astronomy project) |
| CTAO | Container Trucking Association of Ontario |
| CTAO | Canadian Tibetan Association of Ontario (est. 1978; Canada) |
| CTAO | Cairn Terrier Association of Ontario (Ontario, Canada) |
| CTAO | Corporate Tax Administration for Ontario (Canada) |
| CTAO | Cardiology Technologists Association of Ontario |
| CTAO | Cultural and Tourism Affairs Office (Quezon City, Philippines) |