| IOSS | Imaging of Stellar Surfaces 
| Others |
| IOSS | Import One Stop Shop
| Others |
| IOSS | Infinite Open Source Solutions
| Others |
| IOSS | Infrastructure Operations Services Support
| Others |
| IOSS | Input And Output To State Stability
| Others |
| IOSS | Input Output to State Stability
| Others |
| IOSS | Institute Of Sikh Studies
| Others |
| IOSS | Integrated Oilfield Supply and Services
| Others |
| IOSS | Integrated Orbital Service System
| Others |
| IOSS | Intelligence Organization Stationing Study
| Others |
| IOSS | Intensive Outpatient Services and Supports
| Others |
| IOSS | Inter Organizations Study Section
| Others |
| IOSS | Interagency Operations Security (OPSEC) Support Staff
| Others |
| IOSS | Interagency OPSEC Support Staff
| Others |
| IOSS | International Ocular Surface Society
| Others |
| IOSS | International Office Social Sciences
| Others |
| IOSS | Intervention Order Support Service
| Others |
| IOSS | Investigations and Operations Support Section
| Others |
| IOSS | Iowa Organization for Student Success
| Others |
| IOSS | IT Operations Strategies Solutions
| Others |