| Acronym | Definition |
|---|
| FNU➣Fiji National University |
| FNU➣First Name Unknown (geneaology) |
| FNU➣Fusobacterium Nucleatum |
| FNU➣Forschungsstelle Nachhaltige Umweltentwicklung (German: Sustainability and Development Research Unit) |
| FNU➣Formazine Nephelometric Unit |
| FNU➣Fight News Unlimited (boxing podcast) |
| FNU➣Family Name Unknown |
| FNU➣Food and Nutrition Unit (various nations) |