| Acronym | Definition |
|---|
| UIO➣Universitetet I Oslo |
| UIO➣User Mode Input Output |
| UIO➣Universal Input Output |
| UIO➣Ungdom I Oppdrag (Youth with a Mission, Norway) |
| UIO➣Units in Operation |
| UIO➣Universal IO |
| UIO➣Unit Information Officer |
| UIO➣Quito, Ecuador - Marisca (Airport Code) |
| UIO➣Unfunded Investment Opportunity |