| Gamblers Anonymous, Compulsive Gambling Support Services | Vaughan |
| Ganohkwasra Family Assault Support Services, Ohsweken - Chiefswood Rd, Community Counselling | Ohsweken |
| Ganohkwasra Family Assault Support Services, Ohsweken - Chiefswood Rd, Emergency Shelter | Ohsweken |
| Ganohkwasra Family Assault Support Services, Ohsweken - Chiefswood Rd, Next Step Housing | Ohsweken |
| Ganohkwasra Family Assault Support Services, Ohsweken - Sunrise Crt, Youth Lodge | Ohsweken |
| Gay Men's Sexual Health Alliance | Toronto Downtown East |
| Genesis Walk-in and Family Clinic | Halton Hills |
| Genetic Aortic Disorders Association Canada | Mississauga |
| Geneva Centre for Autism | Toronto Downtown North |
| Georgetown Aikido | Georgetown |
| Georgetown Art Express | Georgetown |
| Georgetown Bread Basket, Food Bank | Georgetown |
| Georgetown Globe Productions, Community Musical Theatre Group | Georgetown |
| Georgetown Junior Badminton Club, Recreational Badminton | Georgetown |
| Georgetown Lawn Bowling Club | Georgetown |
| Georgetown Little Theatre Productions | Georgetown |
| Georgetown Pipe Band | Georgetown |
| Georgetown Racquet Club | Georgetown |
| Georgetown Slopitch League | Georgetown |
| Georgetown Soccer Club | Georgetown |
| Georgetown South Junior Badminton Club, Recreational Badminton | Georgetown |
| Girl Guides of Canada, Find a Guiding Unit | Ontario |
| Glenashton Medical Centre, Family Practice and Walk-in Clinic | Oakville |
| GO Transit, Burlington & Oakville, Train Service | Halton South |
| GO Transit, Acton & Georgetown, Train Service | Halton Hills |
| GO Transit, Milton, Train Service | Milton |
| Golden Horseshoe Disabled Sports Association, Vipers Wheelchair Basketball | Burlington |
| Golden Horseshoe Touch Football Association | Burlington |
| Golden Horseshoe Woodturners Guild | Ancaster |
| Golf Canada, Scholarship Program and University Golf Program Grants | Oakville |
| Good Shepherd Centres, Good Shepherd Centres, Family Centre Emergency Shelter Services | Hamilton |
| Good Shepherd Centres, Martha House Location, Good Shepherd Centres, Women's Services | Hamilton |
| Good Shepherd Centres, Good Shepherd Women's Emergency Services, Martha House | Hamilton |
| Good Shepherd Centres, Mary's Place Location, Good Shepherd Centres, Women's Services | Hamilton |
| Good Shepherd Centres, Good Shepherd Women's Emergency Services, Mary's Place | Hamilton |
| Good Shepherd Centres, Notre Dame House Youth Shelter | Hamilton |
| Good Shepherd Centres, Regina's Place Services | Hamilton |
| Good2Talk, Telephone and Virtual Service, Good2Talk Mental Health Supports | Toronto |
| Goodwill Industries, Ontario Great Lakes, Burlington - Upper Middle Road, Integrated Employment Services | Burlington |
| Goodwill Industries, Ontario Great Lakes, Burlington - New St, Retail Store and Community Donation Centre | Burlington |
| Goodwill Industries, Ontario Great Lakes, Burlington - Upper Middle Road, Goodwill Career Centre - Ontario Disability Support Program Employment Supports | Burlington |
| Goodwill Industries, Ontario Great Lakes, Goodwill Pathways to Employment Program | Hamilton |
| Goodwill Industries, Ontario Great Lakes, Goodwill Transitional Employment and Mentoring Program | Hamilton |
| Goodwill Industries, Ontario Great Lakes, Oakville - Speers Rd, Retail Store and Community Donation Centre | Oakville |
| Goodwill Industries, Ontario Great Lakes, Oakville - Trafalgar Rd, Integrated Employment Services | Oakville |
| Great Big Theatre Company, Halton Locations, Childrens' Theatre Arts Programs | Halton Region |
| Greek Community of Burlington and District | Burlington |
| Greenpeace Canada, Community Programs | Toronto |
| Grenfell Ministries, National Overdose Response Service | Hamilton |
| Grindstone Award Foundation, Recreation Expense Assistance for Female Hockey Players | British Columbia |
| Guelph General Hospital, Emergency Department | Guelph |
| Guelph General Hospital | Guelph |
| Guelph General Hospital, Guelph Wellington Care and Treatment Centre for Sexual Assault and Domestic Violence | Guelph |
| Guru Ravidas Gurdwara Sahib Burlington | Burlington |
