| ImmuneMed Co., Ltd | Seoul |
| ImmuneOncia Therapeutics, Inc. | |
| ImmunoForge | Seoul |
| IMMUSE Therapeutics | |
| Imweb Corporation | Seoul |
| iN Therapeutics | |
| INAMES Co., Ltd | Seoul |
| INAVI Systems Corporation | Gyeonggi |
| INCA Internet Corporation | Seoul |
| Incheon Catholic University | |
| Incheon National University | |
| Incheon Technopark | Incheon |
| IncludeWeb | Seoul |
| Induk University | |
| Inet Hosting, Inc. | Seoul |
| Inettech Co., Ltd | Daejeon |
| Infinior Corporation | Gyeonggi |
| Inflearn | Gyeonggi |
| Influential | |
| InfoBank Corporation | Gyeonggi |
| Infrared Remote Solutions, Inc. | Seoul |
| Ingenium Therapeutics | |
| 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 |
| Innovo Therapeutics | |
| INOGENIX | |
| Inplaza Corporation | Seoul |
| Institute for Advanced Engineering | |
| Institute of Electronics Engineers of Korea | Seoul |
| Intekplus Co., Ltd | Daejeon |
| Intellicode Co., Ltd | Gyeonggi |
| Internet Brothers | Seoul |
| Intervest | Seoul |
| Inventage Lab | |
| INZI SOFT | Seoul |
| IPSVentures | |
| iQuest Co., Ltd | Seoul |
| IRISYS | Seoul |
| IRIVER Ltd | Seoul |
| IronAutomation Co., Ltd | Seoul |
| Iruda Planet | |
| ISC Co., Ltd | Gyeonggi |
| ISIS Korea, Inc. | Seoul |