| Fukuyama Heisei University | |
| Fuller Co., Ltd | Chiba |
| FullSpeed, Inc. | Tokyo |
| Fun Plus Co., Ltd | Tokyo |
| Funai Electric Co., Ltd | Osaka |
| Funds, Inc. | |
| FunPep Co., Ltd | |
| Furuno Electric Co., Ltd | |
| Furuno Systems Co., Ltd | Tokyo |
| Fusion Systems | |
| Fuso Dentsu Co., Ltd | Tokyo |
| Futaba Electric Co., Ltd | |
| Future Assist Co., Ltd | Tokyo |
| Future Development Corporation | Tokyo |
| Future Networks | Kanagawa |
| Future Standard Co., Ltd | Tokyo |
| Future University Hakodate | |
| Future Venture Capital Co., Ltd | Kyoto |
| Futurism Works Corporation | Tokyo |
| FVC Tohoku Co., Ltd | Iwate |
| G-STARTUP | |
| GA-Pro | Osaka |
| Gaaboo Co., Ltd | Tokyo |
| Gaiax Co., Ltd | Tokyo |
| Gakushuin University - Department of Mathematics | Tokyo |
| Gakushuin Women's College | |
| Game Do Co., Ltd | Hokkaido |
| Game Freak Co., Ltd | Tokyo |
| Game Studio Co., Ltd | Tokyo |
| Gamecity | Tokyo |
| GameOn Co., Ltd | Tokyo |
| Gatebox, Inc. | |
| Gateway Computer Co., Ltd | Tokyo |
| Gazelle Capital Co., Ltd | Tokyo |
| GDX Co., Ltd | Tokyo |
| General Bussan Co., Ltd | Tokyo |
| Generic Solution Corporation | Tokyo |
| Genesia Ventures Co., Ltd | Tokyo |
| Genetec Corporation | Tokyo |
| Genetus Co., Ltd | Kanagawa |
| Gengo | |
| Geniee, Inc. | Tokyo |
| Genius Web Co., Ltd | Osaka |
| Geno Co., Ltd | Tokyo |
| Genome Miner | Okinawa |
| GenomeNet | |
| Geocode Co., Ltd | Tokyo |
| Geolocation Technology, Inc. | Shizuoka |
| Geometric Space | Tokyo |
| Geospatial Information Authority of Japan | |