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