| Gam Diagnostic Imaging, Oakville - Trafalgar Rd, Diagnostic Imaging | Oakville |
| Gam Diagnostic Imaging, Oakville - Hospital Gate, Diagnostic Imaging | Oakville |
| Gamblers Anonymous | Halton Region |
| Ganohkwasra Family Assault Support Services, Ohsweken - Chiefswood Rd, Emergency Shelter | Ohsweken |
| Gas & Hydro Bill Assistance, Burlington | Burlington |
| Gas & Hydro Bill Assistance, Halton Hills | Halton Hills |
| Gas & Hydro Bill Assistance, Milton | Milton |
| Gas & Hydro Bill Assistance, Oakville | Oakville |
| Generations Church of the Nazarene | Oakville |
| Genesis Pharmacy, Pharmacy Services | Halton Hills |
| Genesis Walk-in and Family Clinic | Halton Hills |
| George Brown College, WAVE Clinic | Toronto |
| Georgetown Agricultural Society, Georgetown Fall Fair | Georgetown |
| Georgetown and District Ministerial Association, Community Unity Halton Hills | Halton Hills |
| Georgetown Bach Chorale | Georgetown |
| Georgetown Bread Basket, Food Bank | Georgetown |
| Georgetown Christian Fellowship | Halton Hills |
| Georgetown Christian Reformed Church | Georgetown |
| Georgetown Globe Productions, Community Musical Theatre Group | Georgetown |
| Georgetown Horticultural Society | Georgetown |
| Georgetown Ladies Powderpuff League | Georgetown |
| Georgetown Lawn Bowling Club | Georgetown |
| Georgetown Little Theatre Productions | Georgetown |
| Georgetown Pharmacy, Pharmacy Services | Halton Hills |
| Georgetown Pipe Band | Georgetown |
| Georgetown Racquet Club | Georgetown |
| Georgetown Rug Hooking Guild | Georgetown |
| Georgetown Slopitch League | Georgetown |
| Georgetown South Junior Badminton Club, Recreational Badminton | Georgetown |
| Glad Tidings Pentecostal Church | Burlington |
| Glen Abbey Ladies Slo Pitch League | Oakville |
| Glen Abbey Slo-Pitch League | Oakville |
| Glen Abbey United Church | Oakville |
| Glen Eden Pharmacy, Pharmacy Services | Milton |
| Glen Oaks Co-operative Homes | Oakville |
| Glenashton Medical Centre, Walk-in Clinic and Family Practice | Oakville |
| Glenashton Pharmacy, Pharmacy Services | Oakville |
| GO Transit, Burlington & Oakville, Train Service | Halton South |
| GO Transit, Acton & Georgetown, Train Service | Halton Hills |
| GO Transit, Head Office | Toronto |
| GO Transit, Milton, Train Service | Milton |
| Golden Horseshoe Chorus | Burlington |
| Golden Horseshoe Post Card Club, Golden Horseshoe Postcard Club Meetings and Events | Hamilton |
| Golden Horseshoe Woodturners Guild | Ancaster |
| Goldencare Pharmacy, Pharmacy Services | Burlington |
| Golf Canada, Canadian Golf Hall of Fame & Museum | 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 |
| Grace Anglican Church | Milton |
| Grace United Church | Burlington |
| Graceway Baptist Church | Milton |
| Grandmother's Voice | Milton |
| Greek Community of Burlington and District | Burlington |
| Green Care Farms, Outdoor Program for People with Dementia | Milton |
| Grenfell Ministries Overdose Prevention Line, National Overdose Response Service | Hamilton |
| Grocery Delivery and Shopping Assistance, Burlington | Burlington |
| Grocery Delivery and Shopping Assistance, Halton Hills | Halton Hills |
| Grocery Delivery and Shopping Assistance, Milton | Milton |
| Grocery Delivery and Shopping Assistance, Oakville | Oakville |
| GTA Home Health Care, In Home Care Services | Georgetown |
| Guardian Aldershot Pharmacy, Pharmacy Services | Burlington |
| Guardian Bonavista Pharmacy, Pharmacy Services | Burlington |
| Guardian Burlington St Joseph's Pharmacy, Pharmacy Services | Burlington |
| Guardian Morelli's Pharmacy, Burlington - Fairview St, Pharmacy Services | Burlington |
| Guardian Morelli's Pharmacy, Burlington - Walkers Line, Pharmacy Services | Burlington |
| Guardian Mountainside Pharmacy, Pharmacy Services | Burlington |
| Guardian Pharmacy, Georgetown - Main St S (Young's Pharmacy and Homecare), Pharmacy Services | Halton Hills |
| Guardian Pharmacy, Oakville - Lakeshore Rd E, Pharmacy Services | Oakville |
| Guardian Pharmacy, Oakville - Lakeshore Rd W (OSR Pharmacy), Pharmacy Services | Oakville |
| Guardian Pharmacy, Oakville - Trafalgar Rd (Cims Pharmacy), Pharmacy Services | Oakville |
| Guardian Pharmacy, Georgetown - Mountainview Rd S (Mountainview Pharmacy), Pharmacy Services | Halton Hills |
| Guelph General Hospital | Guelph |
| Guru Ravidas Gurdwara Sahib Burlington | Burlington |
