| Gyeonggi Technopark | Gyeonggi |
| Gyeonggi University of Science and Technology | |
| Gyeongin National University of Education | |
| GyeongKuk National University | |
| Gyeongnam Technopark | South Gyeongsang |
| Gyeongsang National University | |
| H2O Hospitality Ltd | Seoul |
| Hackle Co., Ltd | Seoul |
| Haenasoft | Gyeonggi |
| Haesung DS | Seoul |
| Hallym Polytechnic University | |
| Hallym University | |
| Hana Financial Group | Seoul |
| HanA IT, Inc. | Daegu |
| HANA Micron, Inc. | South Chungcheong |
| Hana Pharm Co., Ltd | Seoul |
| HANBACK Electronics Ltd | Seoul |
| Hanbat National University | |
| Hanbit Media, Inc. | Seoul |
| Hancom InSpace Co., Ltd | Daejeon |
| Hancom, Inc. | Seoul |
| HanditSoft | Seoul |
| HANDOK | |
| Handong Global University | |
| Handysoft | Gyeonggi |
| Hangang Systems, Inc. | Seoul |
| Hanho Electronics Co. | Incheon |
| Hanics | Incheon |
| Hanil University | |
| Hankuk University of Foreign Studies | |
| Hankyong National University | |
| Hanlim Pharm Co., Ltd | |
| Hanmac | Seoul |
| Hanmi Pharm Co., Ltd | Seoul |
| Hanmi Semiconductor, Inc. | Incheon |
| Hannam University | |
| Hannam University - Department of Mathematics | Daejeon |
| Hansei University | |
| Hanseo University | |
| Hanshin University | |
| Hansung University | |
| Hanwha Aerospace | Seoul |
| Hanyang Cyber University | |
| Hanyang University | |
| Hanyang Women’s University | |
| Hanyeong College University | |
| Hanyoung Nux Co., Ltd | Incheon |
| Happy Smile Co., Ltd | Seoul |
| HappyCGI | Seoul |
| Happytalk | Seoul |