USAPI
| Acronym | Definition |
|---|---|
| USAPI | United States Association of Professional Investigators |
| USAPI | United States Associated Pacific Islands |
| USAPI | United States Affiliated Pacific Islands |
| USAPI | United States Army Peacekeeping Institute |
| USAPI | Unión de Sindicatos y Asociaciones Profesionales Independientes (Spanish: Independent union of Unions and Professional Associations) |