| Acronym | Definition |
|---|
| OHH➣Oceans and Human Health |
| OHH➣Oilfield Helping Hands (est. 2003; Houston, TX) |
| OHH➣Oklahoma Heart Hospital (Oklahoma City, OK) |
| OHH➣Over the Hill Hockey (Ohio) |
| OHH➣Olde Hide House Acton Ontario (Canada) |
| OHH➣Oral Hygiene Habit (dentistry) |