ACTO
| Acronym | Definition |
|---|---|
| ACTO | Advocacy Centre for Tenants Ontario (Toronto, Ontario, Canada) |
| ACTO | Action Officer |
| ACTO | Association for Counselling and Therapy Online (website; est. 2006) |
| ACTO | Alliance of Concerned Transport Organizations (Philippines) |
| ACTO | Amazonian Cooperation Treaty Organization |
| ACTO | Army Communicative Technology Office |
| ACTO | Association of Charter Train Operators (UK) |