| Wrtn Technologies Co., Ltd | |
| X-Power Information Communication Co., Ltd | Incheon |
| XAVIS Co., Ltd | Gyeonggi |
| Xcurenet | Seoul |
| XiteCloud | Seoul |
| XpressEngine | Seoul |
| Y & Archer | |
| Y-Biologics | Daejeon |
| Yangheon Machinery Co., Ltd | |
| Yanolja Co., Ltd | Seoul |
| YCCHEM Co., Ltd | North Gyeongsang |
| Yeonhab Precision Co., Ltd | South Chungcheong |
| Yeosung University | |
| YesNIC | Seoul |
| YEST Corporation | Gyeonggi |
| Yeungjin Cyber University | |
| Yeungjin University | |
| Yeungnam University | |
| Yeungnam University College | |
| Yewon Arts University | |
| Yik Corporation | Gyeonggi |
| YJM Games Co., Ltd | Seoul |
| Yonam College | |
| Yonam Institute of Technology | |
| Yong In University | Gyeonggi |
| Yong-in Arts & Science University | |
| Yonsei University | Seoul |
| Yonsei University - School of Electrical and Electronic Engineering | Seoul |
| YOOYOUNG Pharm. Co., Ltd | North Chungcheong |
| YoungLimWon Soft Lab. Co., Ltd | Seoul |
| Youngnam Foreign Language College | |
| Youngsan University | Busan |
| Yuhan | |
| Yuhan Corporation | Seoul |
| Yuhan University | |
| Yungjin Pharmaceutical Co., Ltd | |
| Yuyu Pharma, Inc. | |
| Zaram Technology, Inc. | Gyeonggi |
| Zeniel | Seoul |
| Zepetto | Seoul |
| Zeroweb Co., Ltd | Busan |
| Zetro Electronic Co., Ltd | Gyeonggi |
| Zeus Co., Ltd | Gyeonggi |
| Zigzag | Seoul |
| Zikto, Inc. | |
| Zipview for Developer | Seoul |
| Zoo Moon Trading Co. | Seoul |
| Zoom Internet Co., Ltd | Seoul |
| Zymedi | |