| Daegu Haany University | |
| Daegu Health College | |
| Daegu National University of Education | |
| Daegu University | North Gyeongsang |
| Daehwa Pharmaceutical Co., Ltd | |
| Daejeon Catholic University | |
| Daejeon Health University | |
| Daejeon University | |
| Daejin University | |
| Daelim University College | |
| Daeshin University | |
| Daewon Pharmaceutical Co., Ltd | |
| Daewon University College | |
| DaeYangTechnology Co., Ltd | Gyeonggi |
| Dagatron | |
| DAIM Research | Seoul |
| Daincube Co., Ltd | |
| Dalcom Soft | Seoul |
| DamoaTech Co., Ltd | Gyeonggi |
| Damonet, Inc. | Seoul |
| Danbee, Inc. | |
| Dankook University | |
| DAOL Investment | Gyeonggi |
| Daou Tech, Inc. | Seoul |
| Daoudata | Seoul |
| Dasah Pharmaceutical Co., Ltd | |
| DASAN Networks, Inc. | Gyeonggi |
| Data Design Engineering | Seoul |
| Data Gate Korea | Seoul |
| Databank, Inc. | Seoul |
| Datadriven Co., Ltd | Seoul |
| DATAIZE | Seoul |
| Dataking Co., Ltd | Seoul |
| Datasolution, Inc. | Seoul |
| Dawonsys Co., Ltd | Gyeonggi |
| Day2Life | Gyeonggi |
| DB HiTek | Gyeonggi |
| DCS Co., Ltd | Seoul |
| DDNS | Seoul |
| Deeply, Inc. | |
| DeepScan | Gyeonggi |
| DeepX | |
| Design Studio R.A.S. | Seoul |
| Desilo, Inc. | |
| Devs United Games | Seoul |
| Devsisters Corporation | Seoul |
| DevStack | Daejeon |
| Devtools | Gyeonggi |
| DewCell Bio | |
| DFtech Co., Ltd | North Chungcheong |