| Abbreviation | Definition |
|---|---|
| ISEA | International Student Exchange Association |
| ISEA | International Students for Environmental Action |
| ISEA | Iowa State Education Association |
| ISEAA | Institute of South East Asian Affairs |
| ISEC | Ipswich Systems Engineering Centre |
| ISEE | Independent School Entrance Exam |
| ISEE | Independent School Entrance Examination |
| ISEET | Indian Science Engineering Eligibility Test |
| ISF | Imaging Science Foundation |
| ISF | International Student Friendship |
| ISFS | ICFAI (Institute of Chartered Financial Analysts of India)School of Financial Studies |
| ISFS | International School for Financial Solutions |
| ISG | Innovative Structures Group |
| ISI | Independent Science Investigation |
| ISI | Indian Statistical Institute |
| ISI | Information Sciences Institute |
| ISI | International Student Interexchange |
| ISI | International Students Incorporated |
| ISIB | Institut Supérieur Industriel de Bruxelles |
| ISIC | International Student Identification Card |