| Abbreviation | Definition |
|---|---|
| ORTD | Office of Research and Technology Development |
| OSAT | Open Source Appropriate Technology |
| OSAT | Open-Source Appropriate Technology |
| OSDT | Optical Sensing and Detecting Technology |
| OSET | Open Source Election Technology |
| OSMT | Office of Science Medicine and Technology |
| OST | Offline Storage Technology |
| OST | On Shore Technology |
| OSTA | Office of Science and Technology Assessment |
| OSTA | Open Systems Technology Associates |
| OSTC | Ocean Science and Technology Cell |
| OSTC | Open Source Technology Center |
| OSTC | Optical Science and Technology Center |
| OSTP | Office of Science and Technology Policy |
| OSTP | Office of Science Technology Policy |
| OSTR | Office of Science and Technology Resources |
| OT | Operational Technology |
| OTA | Office of Technology Alliances |
| OTA | Origin Technology Age |
| OTAP | Oregon Technology Access Program |