| Abbreviation | Definition |
|---|---|
| IUN | Inter-Universities North |
| IUN | Investigational Use Only |
| IUNA | Instituto Universitario Nacional del Arte |
| IUNA | International University of North America |
| IUNC | International Universities Networking Conferences |
| IUO | Igbinedion University Okada |
| IUO | Investigational Use Only |
| IUP | Indiana University of Pennsylvania |
| IUP | Indiana University Press |
| IUP | Institut Universitaire Professionnalis |
| IUP | Inter University Program |
| IUP | International Universities Press |
| IUP | International University Program |
| IUPC | Inter University Programming Contest |
| IUPG | Idaho Universities Policy Group |
| IUPG | Institutions Universitaires de Psychiatrie de Ginebra |
| IUPR | Interamerican University of Puerto Rico |
| IUPUC | Indiana University Purdue University Columbus |
| IUPUC | Indiana University Purdue University Columbus |
| IUPUC | Indiana UniversityPurdue University Columbus |