| IAVGO Community Legal Clinic | Toronto |
| Income Security Advocacy Centre | Toronto |
| Independent Electricity System Operator, Mailing Address, saveONenergy Program | Barrie |
| Independent Order of Odd Fellows, Exeter, Lodge 67 | Exeter |
| Independent Order of Odd Fellows, Stratford - The Grand Lodge of Ontario, Avon Lodge #41 | Stratford |
| Information and Privacy Commissioner of Ontario | Toronto Downtown |
| Insurance Bureau of Canada, Ontario Head Office, Consumer Information Centre | Toronto |
| IODE, Festival Jubilee Chapter | Stratford |
| IPIC Education and Counselling Services, Breastfeeding, Pre and Post Natal Support and Education | Stratford |
| IPIC Education and Counselling Services | Stratford |
| It Takes a Village | North Perth |