| IAM Institute for Advancements in Mental Health, Formally Schizophrenia Society of Ontario | Halton North |
| iCARE Home Health Services | Oakville |
| ICNA Relief Canada, IRC Resource Centre Mississauga, Muslim Family Services | Mississauga |
| IDA - Shelburne - Main St, Caravaggio Drugs | Shelburne |
| IDA Battleford Pharmacy | Mississauga |
| IDA Pharmacy, Bolton - Martha Street (Bolton Lifecare Pharmacy) | Bolton |
| IDA Pharmacy, Brampton - Bramalea Rd, (Brampton Hospital Pharmacy) | Brampton |
| IDA Pharmacy, Brampton - Charolais Blvd (Charolais) | Brampton |
| IDA Pharmacy, Brampton - Ebenezer Rd (Gore) | Brampton |
| IDA Pharmacy, Brampton - Mayfield Rd - (Mayfield Pharmacare) | Brampton |
| IDA Pharmacy, Brampton - North Park Dr (North Park ) | Brampton |
| IDA Pharmacy, Brampton - Rambler Dr - (Saint Peter's) | Brampton |
| IDA Pharmacy, Dundas St W | Mississauga |
| IDA Pharmacy, Etobicoke - Finch Ave (Albion Finch) | Etobicoke North |
| IDA Pharmacy, Etobicoke - Islington Ave (Islington) | Etobicoke North |
| IDA Pharmacy, Etobicoke - Rexdale Blvd (Rexdale Medical Pharmacy) | Etobicoke North |
| IDA Pharmacy, Mississauga, Glen Erin Dr (Thomas Pharmacy) | Mississauga |
| IDA Pharmacy, Mississauga - 2555 Erin Centre Blvd (Erin Centre Pharmacy) | Mississauga |
| IDA Pharmacy, Mississauga - Derry Rd W | Mississauga |
| IDA Pharmacy, Mississauga - Queen St S | Mississauga |
| IDA Pharmacy, Woodbridge - Innovation Dr (Innovation) | Woodbridge |
| IDA Pharmacy / Adapt Home Health Care, Mississauga (Woodland) | Mississauga |
| IDA Pharmacy-Mississauga, Carl's Pharmacy | Mississauga |
| IDA Rathburn Pharmacy | Mississauga |
| iHealth Centre Pharmacy | Woodbridge |
| Imagine Consultations | Caledon (Town of) |
| Immanuel Christian Reformed Church, I-Care Free Furniture Bank | Caledon |
| Indus Community Services, Adult Day Services, Matheson site | Mississauga |
| Indus Community Services, Brampton Branch Office | Brampton |
| Indus Community Services, Brampton Branch Officee - Adult Day Services | Brampton |
| Indus Community Services, Employment Services and HR Bridging Program | Mississauga |
| Indus Community Services, English Language Training, LINC, Mississauga Office | Mississauga |
| Indus Community Services, Health Services - Seniors Wellness Program | Brampton |
| Indus Community Services, Mississauga Head Office | Mississauga |
| Indus Community Services - Brampton Branch Office, Health Services, Caregiver Support Group and Friendly Visiting Program/Telephone Reassurance | Brampton |
| Infant and Child Development Services Peel | Mississauga |
| Infertility Network | Toronto |
| In-Form Physiotherapy and Rehabilitation Centre | Woodbridge |
| Information Oakville | Oakville |
| Inglewood Schoolhouse Performers | Inglewood |
| Insight Diagnostic Imaging, Mississauga Diagnostic Imaging & Breast Centre | Mississauga |
| Institute of Robotics and Intelligent Systems | Mississauga (City of) |
| Intelligent Health Group, Bolton Clinic | Bolton |
| International Centre, Fung Loy Kok Institute of Taoism, Taoist Tai Chi | Mono Mills |
| International Credential Assessment Service of Canada | Guelph |
| Iona Doctors Clinic | Mississauga |
| Islamic Private Board of Education (Ont), Al-Iman School | Brampton |
| Islington Medical Centre | Etobicoke |
| Ivan Franko Homes, Assisted Living/Retirement Residence | Mississauga |