| Acronym | Definition |
|---|
| HIO➣Hole-In-One (chiropractic) |
| HIO➣Halt Input Output |
| HIO➣Health Insuring Organization |
| HIO➣Hire Immigrants Ottawa (Canada) |
| HIO➣Health Information Organization |
| HIO➣Harvard International Office |
| HIO➣Horse Industry Organization |
| HIO➣Hogere Informatica-Opleiding |
| HIO➣High Income Opportunities |
| HIO➣Horse Inspection Organization (inspects walking horses at horse shows) |
| HIO➣High Intensity Operations |