| ImmuneOncia Therapeutics, Inc. | Seoul |
| ImmunoForge | Seoul |
| Imweb Corporation | Seoul |
| INAMES Co., Ltd | Seoul |
| INAVI Systems Corporation | Gyeonggi |
| INCA Internet Corporation | Seoul |
| Incheon Catholic University | |
| Incheon Technopark | Incheon |
| IncludeWeb | Seoul |
| Industrial Bank of Korea | |
| Inet Hosting, Inc. | Seoul |
| Inettech Co., Ltd | Daejeon |
| Infinior Corporation | Gyeonggi |
| Inflearn | Gyeonggi |
| InfoBank Corporation | Gyeonggi |
| Infrared Remote Solutions, Inc. | Seoul |
| Inha University | Incheon |
| Inha University - Department of Mathematics | |
| Inje University | |
| InnobationBio | Seoul |
| Innofin Co., Ltd | Seoul |
| Innomax Co., Ltd | Gyeonggi |
| Innopolis Foundation | Daejeon |
| Innosimulation Co., Ltd | Seoul |
| Innosys Corporation | Seoul |
| Inplaza Corporation | Seoul |
| Institute of Electronics Engineers of Korea | Seoul |
| Intekplus Co., Ltd | Daejeon |
| Intellicode Co., Ltd | Gyeonggi |
| International Symposium on Code Generation and Optimization | Seoul |
| International Vaccine Institute | Seoul |
| Internet Brothers | Seoul |
| Intervest | Seoul |
| Inventage Lab | |
| INZI SOFT | Seoul |
| iQuest Co., Ltd | Seoul |
| IRISYS | Seoul |
| IRIVER Ltd | Seoul |
| IronAutomation Co., Ltd | Gyeonggi |
| Iruda Planet | |
| ISC Co., Ltd | Gyeonggi |
| ISIS Korea, Inc. | Seoul |
| ISOTEC Corporation | Seoul |
| ISTE Co., Ltd | Gyeonggi |
| ISU Abxis Co., Ltd | Gyeonggi |
| iTEC Technologies Ltd | Seoul |
| ITF Co., Ltd | Gyeonggi |
| ITKEY | Seoul |
| Jampick Co., Ltd | Seoul |
| Jawha Electronics Co., Ltd | Seoul |