| IOH | I O Handler
| Others |
| IOH | Implements of Husbandry
| Others |
| IOH | Incorporated Orthopaedic Hospital
| Others |
| IOH | Infiniti Of Honolulu
| Others |
| IOH | Infinity on High
| Others |
| IOH | Innovation Open House
| Others |
| IOH | Innovations in Oral Health
| Others |
| IOH | Institute for Oral Health
| Others |
| IOH | Institute for Organizational Health
| Others |
| IoH | Institute of Horticulture
| Others |
| IOH | Institute of Hospitality
| Others |
| IOH | Instructors Of the Handicapped
| Others |
| IOH | Instruments of Healing
| Others |
| IOH | Interfaith Outreach Home
| Others |
| IOH | Interiors of Harrogate
| Others |
| IOH | intermediate Over Hauling
| Others |
| IOH | Internet Of Health
| Others |
| IOH | Internet Of Humanity
| Others |
| IOH | Internet Of Humans
| Others |
| IOH | Isle of Hope
| Others |