| Abbreviation | Definition |
|---|---|
| ISMART | Integration of Science Math And Reflective Teaching |
| ISME | Inspiring Science Mathematics Education |
| ISME | Institute for Science and Math Education |
| ISNB | Interactive Science Notebooks |
| ISP | Independent Study Project |
| ISP | Individualized Service Plan |
| ISP | Information Society Project |
| ISP | In-Sessional Program |
| ISPE | Independent Study Physical Education |
| ISPE | Independent Surf Physical Education |
| ISPL | Individualized Self Paced Learning |
| ISS | In School Suspension |
| ISS | Indiana Science Standards |
| ISSE | Institute for the Study of Somatic Education |
| ISSIP | International Society of Service Innovation Professionals |
| ISSMA | Indiana State School Music Association |
| ISST | In School Support Teacher |
| ISTA | Idaho Science Teachers Association |
| ISTA | Illinois Science Teachers Association |
| ISTA | Indiana State Teachers Association |