| IOI | I'm Over It 
| Others |
| IOI | Ideal Of Idols
| Others |
| IOI | Imaging Of Infections
| Others |
| IOI | Independent Opportunities Inc
| Others |
| IOI | Indication of Interest
| Others |
| IOI | Indications Of Interest
| Others |
| IOI | Indicator of Interest
| Others |
| IOI | Industrial Opportunities Inc
| Others |
| IOI | Industry Operations Investigator
| Others |
| IOI | Industry operations investigators
| Others |
| IOI | Injured Other Than Hostilities or Illness
| Others |
| IOI | Innovative Online Industries
| Others |
| IOI | Input Output Interface
| Others |
| IOI | Input Output Interfaces
| Others |
| IOI | Institut Otomotif Indonesia
| Others |
| IOI | Institute of Imagination
| Others |
| IOI | Integrated Orbital Implants
| Others |
| IOI | Inter Onset Interval
| Others |
| IOI | Intercultural Outreach Initiative
| Others |
| IOI | International Ocean Institute
| Others |
| IOI | International Olympiad in Informatics
| Others |
| IOI | International Ombudsman Institute
| Others |
| IOI | International Outfall Intercepter
| Others |
| IOI | Internet Of Ideas
| Others |
| IOI | Internet Of Identities
| Others |
| IOI | Internet Of Infrastructure
| Others |
| IOI | Internet Of Insurance
| Others |
| IOI | Internet Of Intelligences
| Others |
| IOI | Internet Overlords International
| Others |
| IOI | Invest in Open Infrastructure
| Others |
| IOI | Island of Ireland
| Others |
| IOI | Item of Interest
| Others |
| IOI | Items Of Interest
| Others |