| Nine Industries Co., Ltd | Seoul |
| Ninebell Co., Ltd | |
| NITGEN | Seoul |
| NKMax Co., Ltd | Gyeonggi |
| Nomad Coders | Seoul |
| Noul Co., Ltd | |
| Novelty Nobility, Inc. | |
| Novorex, Inc. | |
| NPIXEL Co., Ltd | Seoul |
| NRISE, Inc. | |
| Nueyne Co., Ltd | |
| Nuriplex Co., Ltd | Seoul |
| NVESTOR Co., Ltd | |
| NvisANA | Gyeonggi |
| O2Mobile Software, Inc. | Seoul |
| OBIGO, Inc. | Seoul |
| Octa Solution | Seoul |
| OKY R&D Co., Ltd | Seoul |
| OLIMPLANET, Inc. | |
| OMNIOUS Co., Ltd | |
| Oncocross Co., Ltd | Seoul |
| Onconic Therapeutics | |
| ONDA, Inc. | Seoul |
| Ondokisul Sentech Co., Ltd | Seoul |
| One Semiconductor | |
| Onecom Co., Ltd | Gyeonggi |
| OneMoreSecurity, Inc. | Sejong |
| Onepredict, Inc. | |
| Open Cyber University of Korea | |
| OPTOLANE Technologies, Inc. | Gyeonggi |
| Oracle Korea Co., Ltd | Seoul |
| Oracom Co., Ltd | Seoul |
| Osan University | |
| OSANG Healthcare Co., Ltd | |
| Oscotec, Inc. | Gyeonggi |
| Outcode | Seoul |
| Owwl | Seoul |
| Pagecall, Inc. | |
| Pai Chai University | |
| PAIX Co., Ltd | |
| PallyCon | Seoul |
| Panacell Biotech Co., Ltd | Seoul |
| Pangyo Technovalley | Gyeonggi |
| Panmnesia | |
| Papaya Co., Ltd | Seoul |
| Paramark Ventures Co., Ltd | |
| Park Systems | Gyeonggi |
| Parkcom | Seoul |
| Paygate Co., Ltd | Seoul |
| Payhere, Inc. | Seoul |