| Acronym | Definition |
|---|
| ABTO➣Association of Belgian Tour Operators (est. 1973) |
| ABTO➣Association of Basic Telecom Operators |
| ABTO➣Abert's Towhee (bird species) |
| ABTO➣Association of British Tennis Officials |
| ABTO➣Applied Business Technology Online (certification program; Canada) |
| ABTO➣American Board of Otolaryngology (Houston, TX) |