| Acronym | Definition |
|---|
| SIO➣Scripps Institution of Oceanography |
| SIO➣Set It Off (entertainment) |
| SIO➣Studentsamskipnaden i Oslo |
| SIO➣South Indian Ocean |
| SIO➣Storytelling in Organizations (National Storytelling Network) |
| SIO➣Senior International Officer (various organizations) |
| SIO➣Secure Identity Object (data model) |
| SIO➣Second Institute of Oceanography (China) |
| SIO➣Storage Input Output |
| SIO➣System Input Output |
| SIO➣Serial Input Output |
| SIO➣Server Indirection Object |
| SIO➣Service Information Object |
| SIO➣Scalable Input Output |
| SIO➣Shareable Interface Object |
| SIO➣Super Input Output |
| SIO➣Start Input Output |
| SIO➣Serial Input/Output |
| SIO➣Senior Intelligence Officer |
| SIO➣Social Investment Organization (Canada) |
| SIO➣Spit It Out |
| SIO➣Service Inventory Optimization (software) |
| SIO➣Special Information Operations (US DoD) |
| SIO➣State Investment Officer (various locations) |
| SIO➣Service Information Octet (SS7) |
| SIO➣Skidaway Institute of Oceanography |
| SIO➣Senior Investigation Officer (UK) |
| SIO➣serious inquiries only |
| SIO➣Systems Integration Office |
| SIO➣Strategic Initiatives Overview (management) |
| SIO➣Societas Internationalis Odonatologica |
| SIO➣Services in Operation |
| SIO➣Standard Installation Organization |
| SIO➣Ship's Information Officer (US Navy) |
| SIO➣Status Indication Out of Alignment (SS7) |
| SIO➣Simultaneous Input Output |
| SIO➣Shanghai Informatization Office |
| SIO➣Section Interorganisations |
| SIO➣Slave Input/Output |
| SIO➣Student Islamic Organization (India) |
| SIO➣Stakeholder Involvement Office |
| SIO➣Security and Information Operations |
| SIO➣Synchronizing Intermediate Objectives |
| SIO➣Scalable Input/Output Initiative (California Institute of Technology) |
| SIO➣SOGS Interface Unit |
| SIO➣Special Intelligence Officer |
| SIO➣Sprint Integrated Office |
| SIO➣Safety Interlock Override |
| SIO➣Smart Input/Output (part of TEDS from IEEE standard 1451.1) |
| SIO➣Supply Item Order |
| SIO➣Social Improvement Organization |