| Abbreviation | Definition |
|---|---|
| ICLS | Inter Culture Language School |
| ICMS | Independence Charter Middle School |
| ICMS | Indian Creek Middle School |
| ICMS | Irvington Community Middle School |
| ICNHS | Iligan City National High School |
| ICNHS | Iloilo City National High School |
| ICNS | Illinois Coalition of Nonpublic Schools |
| ICS | International Correspondence School |
| ICSA | International Community School of Abidjan |
| ICSBA | International Centre For Study Of Bengal Art |
| ICSD | Iron County School District |
| ICSD | Ithaca City School District |
| ICSIS | ICS International School |
| ICSK | Indian Community School Kuwait |
| ICSN | Idaho Charter School Network |
| ICST | Immaculate Conception School of Theology |
| ICSV | International Christian School of Vienna |
| ICSV | International Christian School Vienna |
| ICSZ | Inter-Community School of Zurich |
| IDCS | Integrated Day Charter School |