| Acronym | Definition |
|---|
| IOI➣International Olympiad in Informatics |
| IOI➣Island of Ireland |
| IOI➣Interest on Investment (finance) |
| IOI➣Innovative Online Industries |
| IOI➣International Ocean Institute |
| IOI➣Indian Ocean Islands |
| IOI➣Institute of Informatics (various locations) |
| IOI➣Indicator of Interest |
| IOI➣International Ombudsman Institute (Canada) |
| IOI➣Indication of Interest |
| IOI➣Interuniversitair Oogheelkundig Instituut (Dutch) |
| IOI➣Independent Opportunities, Inc. (Tulsa, OK) |
| IOI➣Innovations in Optics, Inc. (Woburn, MA) |
| IOI➣Identity of Interest |
| IOI➣Item of Interest |
| IOI➣Interonset Interval (music composition) |
| IOI➣Israel Opportunity Investor (blog) |
| IOI➣In Orbit Infrastructure |
| IOI➣Interim Operating Instructions |
| IOI➣Integrated Operating Instruction (specifically, how to start up or shut down a nuclear power plant) |
| IOI➣Items of Importance |
| IOI➣Internal Operating Instruction |
| IOI➣Inter-Ocular Impact (hits you right between the eyes) |
| IOI➣Item of Inspection |
| IOI➣Internal Operating Income |