PROI
| 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 |