| Buzzvil Co., Ltd | |
| BZeye | Seoul |
| C&Tech Co., Ltd | |
| C.O.D.E. | Seoul |
| Cablecon | Seoul |
| Cabsoft | Seoul |
| Cafe24 Corporation | Seoul |
| Cakeplabs Co., Ltd | Seoul |
| Caliverse | Seoul |
| Callgate Co., Ltd | Seoul |
| CamacKorea Co., Ltd | Gyeonggi |
| CanariaBio, Inc. | |
| CanTops Co., Ltd | Gyeonggi |
| Capstone Partners Co., Ltd | Seoul |
| Care Square Co., Ltd | Seoul |
| Caregen Co., Ltd | |
| Caret Games, Inc. | |
| Catenoid, Inc. | |
| Catholic Kwandong University | |
| Catholic Sangji College | |
| Catholic University of Korea | |
| CBIOMEX, Inc. | |
| CDNetworks | Seoul |
| Celemics, Inc. | Seoul |
| Cell2in, Inc. | |
| CellabMED | |
| Celldi Co., Ltd | |
| CELLID | |
| Cellivery | Seoul |
| Celltrion, Inc. | |
| Cenyx Biotech | |
| CGlink | Seoul |
| CHA Biotech | Gyeonggi |
| CHA Biotech Co., Ltd | |
| CHA Biotech Co., Ltd | |
| CHA University | |
| CHAI | |
| CHAI Corporation | Seoul |
| Changshin University | |
| Changsoft i&i | Seoul |
| Changwon Moonsung University | South Gyeongsang |
| Changwon National University | |
| Cheil Worldwide, Inc. | |
| Cheju Halla University | |
| Cheongam College | |
| Cheongjiu University | |
| Cheongju National University of Education | |
| Chinju National University of Education | |
| Chodang University | |
| Chong Kun Dang Holdings Corporation | |