| Acronym | Definition |
|---|
| PROI➣Public Relations Organisation International |
| PROI➣Political Return on Investment (New Progressive Coalition, LLC trademark) |
| PROI➣Public Record Office of Ireland (now National Archives of Ireland) |
| PROI➣Person Resident outside India |
| PROI➣Phalangeal Region of Interest (medical imaging) |
| PROI➣Personal Return of Investment |