| United Nations University | |
| United Precision Technologies Co., Ltd | Tokyo |
| UNITED, Inc. | Tokyo |
| UNIVA Paycast Ltd | Tokyo |
| Universal Knowledge Co., Ltd | Tokyo |
| Universal Materials Incubator Co., Ltd | |
| University of Aizu | |
| University of East Asia | |
| University of Electro-Communications | |
| University of Electro-Communications - Graduate School of Information Systems | Tokyo |
| University of Fukuchiyama | |
| University of Fukui | |
| University of Human Arts and Sciences | |
| University of Human Environments | |
| University of Hyogo | |
| University of Kitakyushu | |
| University of Kochi | |
| University of Marketing and Distribution Sciences | |
| University of Miyazaki | |
| University of Nagano | |
| University of Nagasaki | |
| University of Niigata Prefecture | |
| University of Occupational and Environmental Health | |
| University of Shiga Prefecture | |
| University of Shimane | |
| University of Shizuoka | |
| University of Teacher Education Fukuoka | |
| University of the Ryukyus | |
| University of the Sacred Heart, Tokyo | |
| University of Tokyo | Tokyo |
| University of Tokyo - Department of Electrical and Electronic Engineering | Tokyo |
| University of Tokyo - Graduate School of Mathematical Sciences | Tokyo |
| University of Tokyo - Jouhou System Kougaku Laboratory | Tokyo |
| University of Tokyo Health Sciences | |
| University of Toyama | |
| University of Toyo - Department of Information Science | Tokyo |
| University of Tsukuba | Ibaraki |
| University of Tsukuba - Department of Computer Science | Ibaraki |
| University of Tsukuba - Institute of Mathematics | Ibaraki |
| University of Yamanashi | |
| UntroD | |
| Up-frontier Co., Ltd | Tokyo |
| Update, Inc. | Tokyo |
| Upware Co., Ltd | Tokyo |
| UQ Communications, Inc. | Tokyo |
| Urakami Research & Development Co., Ltd | Kanagawa |
| Urawa University | |
| Urayama Gakuen | |
| Urban Internet | Tokyo |
| Uro Electronics Ind. Co., Ltd | Tokyo |