| Acronym | Definition |
|---|
| FIO➣For Information Only |
| FIO➣Fundusz Inicjatyw Obywatelskich (Polish: Civic Initiatives Fund) |
| FIO➣Fournitures Industrielles de l'Ouest (French: Western Industrial Supplies) |
| FIO➣Fusion-Io (stock symbol) |
| FIO➣Fundusz Inwestycyjny Otwarty (Polish: Open-End Investment Fund) |
| FIO➣Future Input Output |
| FIO➣File Input Output |
| FIO➣Frame Input Output |
| FIO➣Fraction of Inspired Oxygen |
| FIO➣Faecal Indicator Organism (sewage) |
| FIO➣Florida Institute of Oceanography |
| FIO➣Free In and Out |
| FIO➣Federal Insurance Office (US Treasury Department) |
| FIO➣Frais Institutionnels Obligatoires (French: Required Institutional Fees; Canada) |
| FIO➣Figure It Out |
| FIO➣Field Intelligence Officer (various locations) |
| FIO➣First Institute of Oceanography (China) |
| FIO➣Fire Investigation Officer (UK) |
| FIO➣Future Insurability Option (insurance rider) |
| FIO➣Future Is Ours |
| FIO➣Faculty Information Officer (various universities) |
| FIO➣Factory Installable Option |
| FIO➣Financing and Insurance Operations |
| FIO➣Fiber and Integrated Optics (journal) |
| FIO➣Factory Integration Only |
| FIO➣Frontier in Optics (Optical Society of America conference) |
| FIO➣Field Information Officer |
| FIO➣Fitness Institute Online |
| FIO➣Frequency In & Out |
| FIO➣Foreign Intelligence Office/Officer |
| FIO➣Force XXI Integration Office/Officer |
| FIO➣Flight Inspection Office (Federal Aviation Administration) |
| FIO➣Federated Input/Output (electronics) |
| FIO➣Fleet Intelligence Office (US Navy) |
| FIO➣Forecast Informed Operations (California Department of Water Resources) |
| FIO➣Fieldnetwork Input/Output |