| Ian Anderson House, Residential Hospice | Oakville |
| IAVGO Community Legal Clinic | Toronto |
| iCARE Home Health, In-Home Care Services | Oakville |
| ICNA Relief Canada, Head Office, Muslim Family Services - Food Bank | Mississauga |
| ICNA Relief Canada, Head Office, Muslim Family Services | Mississauga |
| ICNA Sisters Milton | Milton |
| IDA Brant Arts Pharmacy, Pharmacy Services | Burlington |
| IDA Brant Arts Pharmacy, Burlington - Brant St, Home Health Care Products | Burlington |
| IDA Burlington Drug Mart, Pharmacy Services | Burlington |
| IDA Burlington Heights Pharmacy, Pharmacy Services | Burlington |
| IDA Maple Pharmacy, Pharmacy Services | Burlington |
| IDA MedProHealth Pharmacy, Pharmacy Services | Burlington |
| IDA Mount Royal Pharmacy, Pharmacy Services | Burlington |
| IDA Pharmacy, Oakville - Third Line (Royal Oak Pharmacy), Pharmacy Services | Oakville |
| IDA Pharmacy, Oakville - Argus Rd (St Mark's Pharmacy), Pharmacy Services | Oakville |
| IDA Pharmacy, Georgetown - Guelph St (King Cove Pharmacy), Pharmacy Services | Halton Hills |
| IDA Pharmacy, Oakville - Queensbury Cres (Upper Middle Pharmacy), Pharmacy Services | Oakville |
| IDA Pharmacy, Oakville - Oak Park Blvd (Central Park Pharmacy), Pharmacy Services | Oakville |
| IDA Pharmacy, Oakville - Ford Dr (Ford Dr Pharmacy), Pharmacy Services | Oakville |
| IDA Pharmacy, Oakville - Burnhamthorpe Rd E (Sav-On Pharmacy), Pharmacy Services | Oakville |
| IDA St Mary Pharmacy, Pharmacy Services | Burlington |
| IDEA Lab Kids - East Oakville, Oakville, Licensed Child Care Centre | Oakville |
| Ignite Artistic Swimming Club | Burlington |
| Immigration and Refugee Board of Canada. Central Region, Toronto | Toronto |
| Immigration, Refugees, and Citizenship Canada, Canadian Citizenship and Immigration Services | Hamilton |
| Impactus, Impactus Ministries | Burlington |
| In Home Haircuts by Sam | Mississauga |
| Inclusion Canada | Toronto Downtown Central |
| Income Security Advocacy Centre | Toronto |
| Income Tax Clinics, Burlington | Burlington |
| Income Tax Clinics, Halton Hills | Halton Hills |
| Income Tax Clinics, Milton | Milton |
| Income Tax Clinics, Oakville | Oakville |
| Independent Living Halton, Deborah's Home and Attendant Outreach Services | Milton |
| Indigenous Diabetes Health Circle, Indigenous Diabetes Health Circle, Niagara Region | Thorold |
| Indigenous Network, Indigenous Programs | Mississauga |
| Indspire | Toronto |
| Indus Community Services, Oakville Office, Employment Services | Oakville |
| Indus Community Services, Family Services, Brampton Gillingham Office | Brampton |
| Indus Community Services, Family Services, Mississauga Head Office - Hurontario Suite 206 | Mississauga |
| Indus Community Services, Newcomer Services, Brampton Gillingham Office, Brampton - Gillingham Dr Office | Brampton |
| Indus Community Services, Newcomer Services, Mississauga Head Office - Hurontario Suite 206, Mississauga - Head Office | Mississauga |
| Infant Car Seats, Booster Seats, Halton Region | Halton Region |
| Infinity Health Centre, Walk-in Clinic | Oakville |
| Information and Privacy Commissioner of Ontario | Toronto |
| Information Burlington | Burlington |
| Information Halton Hills | Halton Hills |
| Information Milton | Milton |
| Information Oakville | Oakville |
| Injured Workers Community Legal Clinic | Toronto |
| Inkwell Montessori School, Licensed Child Care Centre | Georgetown |
| Innocence Canada, Toronto | Toronto |
| Innomar Specialty Pharmacy, Pharmacy Services | Burlington |
| InsideHalton.com | Halton Region |
| Insight Health Solutions - Trillium Health Partners | Oakville |
| InspiAIR Mississauga | Dixie |
| Inspire Halton | Halton Hills |
| Institute for Advancements in Mental Health, Toronto Provincial Office | Toronto |
| Insurance Bureau of Canada, Ontario Head Office, Consumer Information Centre | Toronto |
| Interfaith Council of Halton | Oakville |
| Interligne | Québec |
| International Association for Medical Assistance to Travellers | York Region |
| International Credential Assessment Service of Canada | Guelph |
| International Development and Relief Foundation, Toronto Office, International and Local Education Programs | Toronto |
| International Dyslexia Association - Ontario Branch | Toronto |
| International Railroad for Queer Refugees | Toronto |
| Interval House of Hamilton, Flamborough Women's Resource Centre Location, Counselling and Community Services | Hamilton |
| Interval House of Hamilton, Victoria and Friends Women's Shelter | Hamilton |
| Intrada Brass | Oakville |
| In-Trend Home Solutions GTA | Etobicoke South |
| IODE, Oakville - Angela Bruce Chapter, Thrift Shop | Oakville |
| Iranian Women's Organization of Ontario | Toronto |
| Ironoak Pharmacy, Pharmacy Services | Oakville |
| Ironwood Project (The), Support for Survivors of Childhood Sexual Abuse | Halton Hills |
| Iroquois Ridge Medical & Dermal, Family Practice and Walk-in Medical Clinic | Oakville |
| iScope Concussion and Pain Clinics, Mississauga | Cooksville |
| Islamic Community Centre of Milton | Milton |
| Islamic Community of Oakville | Oakville |
| Islamic Relief Canada | Burlington |
| Italian Canadian Club of Burlington | Burlington |
| Italian Cultural Centre of Milton | Milton |
