| Company | Industry | City |
| G4BOX Inc. | Games | Toronto |
| Gambatte Corporation | Professional Services | Mississauga |
| Game Pill Inc. | Games | Aurora |
| Gandy Associates Language and Communication Specia | Mississauga | |
| Ganz Interactive | Games | Woodbridge |
| Gardiner Roberts LLP | Toronto | |
| GCI Group | Toronto | |
| gDial | Toronto | |
| George Brown College - School of Design | Toronto | |
| GestureTek Inc | Toronto | |
| Giant Step Inc | Toronto | |
| GK Media Design | Toronto | |
| gl-ue | Toronto | |
| Global Interactive Events | Mississauga | |
| GlobalEx | Toronto | |
| GoodMedia Inc. | Toronto | |
| Gorica Productions | Toronto | |
| Gorrie Marketing | Mississauga | |
| Gowling Lafleur Henderson LLP | Toronto | |
| GRAND Creative | Toronto | |
| Grant Systems Engineering Inc. | King City | |
| Greater Toronto Marketing Alliance | Unions, Guilds, Associations | Toronto |
| Green Hat Digital | Toronto | |
| Grip Limited | Toronto | |
| Groove Media Inc. | Toronto | |
| Gustavo Machado Studio | Toronto |