| Acronym | Definition |
|---|
| IDO | Indio (Amtrak station code; Indo, CA) |
| IDO | indoleamine 2,3-dioxygenase |
| IDO | International Dance Organization |
| IDO | Interpolated Dynamic Oversampling |
| IDO | Industrial Diesel Oil (oil refining) |
| IDO | International Development Organization |
| IDO | Idaho Operations Office |
| IDO | Instituto de Oceanologia (Spanish: Institute of Oceanology; Cuba) |
| IDO | Installation Deployment Officer |
| IDO | Intermediate Development Outcome (agriculture) |
| IDO | Initial Defensive Operations |
| IDO | Investment Development Office (various organizations) |
| IDO | International Defense Organization |
| IDO | Istanbul Deniz Otobüsleri A.S. (Istanbul Sea Bus Corp.) |
| IDO | Information Dissemination Organization |
| IDO | Incentive Determining Official |
| IDO | Islamic Development Organization (Tehran, Iran) |
| IDO | Indoctrination Duty Officer |
| IDO | Informal Design Overview |
| IDO | Identification Operator |