| Abbreviation | Definition |
|---|---|
| HKCF | Hong Kong Chess Federation |
| HRCC | Hampton Roads Chess Club |
| ICA | Illinois Chess Association |
| ICC | Internet Chess Club |
| ICCA | International Computer Chess Association |
| ICCF | International Correspondence Chess Federation |
| ICF | Icon Chess Foundation |
| ICF | International Chess Foundation |
| ICS | International Chess School, Montville, New Jersey |
| ICU | Irish Chess Union |
| IECG | International Email Chess Group |
| IECG | International E-mail Chess Group |
| IPCCC | International Paderborn Computer Chess Championship |
| IQ | Intelligent Queen |
| IRCF | Indie Rock Chess Federation |
| IWCC | Independent World Chess Championship |
| JCC | Jacksonville Chess Club |
| JCPI | Java Chess Protocol Interface |
| K | King |
| KB | King's Bishop |