| ISES | Indian Springs Elementary School 
| Others |
| ISES | Individual Student Enrollment System
| Others |
| ISES | Innovative Special Education Services
| Others |
| ISES | Institute of Sport and Exercise Science
| Others |
| ISES | Integrated Solid Earth Science
| Others |
| ISES | Integrated Speaker Education System
| Others |
| ISES | International Society for Endovascular Surgery
| Others |
| ISES | International Society for Equitation Science
| Others |
| ISES | International Society of Endovascular Specialists
| Others |
| ISES | International Society of Exposure Science
| Others |
| ISES | International Solar Energy Society
| Others |
| ISES | International Space Environment Service
| Others |
| ISES | International Special Event Society
| Others |
| ISES | International Special Events Society
| Others |
| ISES | International Student Education Services
| Others |
| ISES | International Student Energy Summit
| Others |
| ISES | International Student Exchange Services
| Others |
| ISES | Intrinsically Safe Electrical System
| Others |