- DIO stands for Diode
- DIO stands for Defence Infrastructure Organisation (UK)
- DIO stands for Délégué à l’Information et à l’Orientation (French: Delegate for Information and Guidance)
- DIO stands for Digital Input/Output
- DIO stands for Designated Institutional Official
- DIO stands for Defence Intelligence Organisation (Australia)
- DIO stands for Days Inventory Outstanding
- DIO stands for Down in One
- DIO stands for District Informatics Officer (India)
- DIO stands for Data Input-Output
- DIO stands for Defence Industries Organisation (Iran)
- DIO stands for Dealer Installed Option (automotive)
- DIO stands for Defensive Information Operations
- DIO stands for Discrete Input/Output
- DIO stands for Defense Intelligence Officer
- DIO stands for Division Informatique de l’Observatoire (French: Computing Division of the Observatory)
- DIO stands for Direct Input Output
- DIO stands for Digital Information Office
- DIO stands for Deiodinase, Iodothyronine
- DIO stands for Director of Industry Operations (Bureau of Alcohol, Tobacco and Firearms)
- DIO stands for Dépistage Individuel Organisé du Cancer (French: Screening Individuals with Cancer; software)
- DIO stands for Division Information Officer
- DIO stands for District Intelligence Officer
- DIO stands for Dietary-Induced Obesity
- DIO stands for Director of Industrial Operations
- DIO stands for Directorate of Industrial Operations
- DIO stands for District Irrigation Officer
- DIO stands for Dave Ivaz Orchestra
- DIO stands for Deferred Interest Obligation
- DIO stands for Device Integration Object
- DIO stands for Declaration of International Operations (US FAA)
DIO