| GeoTrust Japan, Inc. | Tokyo |
| GeSource | Tokyo |
| GEXVal, Inc. | |
| Gifu City Women's College | |
| Gifu College of Nursing | |
| Gifu Kyoritsu University | |
| Gifu Pharmaceutical University | |
| Gifu University | |
| Gifu University of Health Sciences | |
| Gifu University of Medical Science | |
| GignoSystem Japan, Inc. | Tokyo |
| Gihyo.jp | Tokyo |
| Ginco Co., Ltd | Tokyo |
| Glad Cube Co., Ltd | Osaka |
| Global Cast Co., Ltd | Aichi |
| Global Information, Inc. | Tokyo |
| Global Mobility Services Co., Ltd | Tokyo |
| Global Net Corporation | Tokyo |
| Global Partners Co., Ltd | Chiba |
| Global Partners Technology Co., Ltd | Tokyo |
| Global Solutions Corporation | Tokyo |
| Global Systems Co., Ltd | Tokyo |
| Global Tech Co., Ltd | Osaka |
| Global Venture Vapital | |
| Global Web Internet Service | Tokyo |
| Globis Capital Partners | Tokyo |
| GLOBIS Corporation | Tokyo |
| GlyTech Co., Ltd | Kyoto |
| GlyTech, Inc. | |
| GMO Internet Group | Tokyo |
| GMO VenturePartners | |
| GNT, Inc. | Tokyo |
| GO, Inc. | |
| GOALS | |
| GOB Incubation Partners Co., Ltd | Tokyo |
| GoF Co., Ltd | |
| GOGA, Inc. | Tokyo |
| Gon Web Innovations Co., Ltd | Tokyo |
| Gonbei Domain | Tokyo |
| Goo | Tokyo |
| Goos Corporation | Tokyo |
| Goryo Chemical Co., Ltd | Hokkaido |
| Grab Systems | Tokyo |
| Graduate Institute for Entrepreneurial Studies | |
| Graduate School for the Creation of New Photonics Industries | |
| Graduate School of Management, GLOBIS University | |
| Graduate University for Advanced Studies, SOKENDAI | |
| Grani Co., Ltd | Tokyo |
| GrapeCity, Inc. | Miyagi |
| Gree Co., Ltd | Tokyo |