| Acronym | Definition |
|---|
| EIO | Emergency Information Officer (Canada) |
| EIO | Extreme Input Output |
| EIO | Execute Invalid Opcode |
| EIO | Enhanced Input Output |
| EIO | Error Input Output |
| EIO | Executive Informational Overview |
| EIO | Enhanced Input/Output |
| EIO | Enterprise Inventory Optimization (software) |
| EIO | Evermore Integrated Office |
| EIO | Electronic in Out (software) |
| EIO | Extended Interaction Oscillator |
| EIO | Equipment Inventory Office |
| EIO | Electronic Insurance Office |
| EIO | Event Input Output |
| EIO | Electronics Industry Outlook |
| EIO | European International Orientation |
| EIO | Ensemble Instrumental de l'Ouest (French: Instrumental Ensemble of West) |
| EIO | Ethernet Input/Output (networks) |
| EIO | Environmental Investment Organisation (UK) |