| HeartLanguage, Inc. | |
| Hearts Technology Corporation | Kanagawa |
| Heartseed Co., Ltd | Tokyo |
| Heisei International University | |
| HekaBio Co., Ltd | Tokyo |
| Helpfeel, Inc. | |
| Helpnet Japan Mayday Service Co., Ltd | Tokyo |
| Henka Co., Ltd | Tokyo |
| Hennge Co., Ltd | Tokyo |
| Hepalys | |
| HERO Co., Ltd | |
| Heroz Co., Ltd | Tokyo |
| Hic Service Corporation | Tokyo |
| Higashi Nippon International University | |
| High Availability Systems Co., Ltd | Tokyo |
| Highflyer Co., Ltd | Tokyo |
| Hightec Systems Co., Ltd | Kanagawa |
| Hiiragi Software Development Co., Ltd | Tokyo |
| Hijiyama University | |
| Hikari Tsuchin, Inc. | Tokyo |
| HIKKY | |
| Himeji Dokkyo University | |
| Himeji Hinomoto College | |
| Himeji Rika Co., Ltd | Hyogo |
| Hino Engineering Co., Ltd. | |
| Hirakata Gakuen | |
| Hirakawa Hewtech Corporation | |
| Hirata Corporation | Kumamoto |
| Hirosaki Gakuin University | |
| Hirosaki University - Department of Mathematical Sciences | Tokyo |
| Hirosaki University Tsugarusho | |
| Hiroshima Bunka Gakuen | |
| Hiroshima Bunkyo University | |
| Hiroshima City University | |
| Hiroshima Institute of Technology | |
| Hiroshima International University | |
| Hiroshima Jogakuin University | |
| Hiroshima Shudo University | |
| Hiroshima University | |
| Hiroshima University - Department of Mathematics | Hiroshima |
| Hiroshima Venture Capital Co., Ltd | |
| Hiroshma University of Economics | |
| Hirotsu Bioscience Co., Ltd | Tokyo |
| Hisol Co., Ltd | Tokyo |
| Hitachi Automation Co., Ltd | Tokyo |
| Hitachi High-Technologies Corporation | Tokyo |
| Hitachi Kokusai Electric, Inc. | Tokyo |
| Hitachi Ltd | Tokyo |
| Hitachi Power Solutions Co., Ltd | Ibaraki |
| Hitachi Solutions Ltd | Tokyo |