OHO
| Acronym | Definition |
|---|---|
| OHO | Old Harbor Outfitters (Bridgeport, CT fishing apparel and gear) |
| OHO | Offenes Haus Oberwart (German: Open House Oberwart; contempory art venue; Oberwart, Austria) |
| OHO | Ohio Hospice Organization |
| OHO | Online Harness Owner, Inc |
| OHO | Oral Health Office (Department of Preventive Medicine; Cambodia) |
| OHO | One Horse Outfit (clothing; Orange, CA) |