| Ray Pharmacy, Pharmacy Services | Oakville |
| Realm Medical Clinic, Walk-in Medical Clinic | Burlington |
| Rebecca Medical Walk-In Clinic, Walk-in Medical Clinic | Oakville |
| Redhill Church | Milton |
| Redleaf Cultural Integration, Burlington Chinese Community Connection | Burlington |
| Region of Halton Dart League | Georgetown |
| Rehoboth Canadian Reformed Church of Burlington-Waterdown | Burlington |
| Re-Imagine Ontario, Community Supports for Vulnerable Youth and Seniors | Oakville |
| Remedy's Rx Aldershot Village Pharmacy, Pharmacy Services | Burlington |
| Remedy's Rx New St Pharmacy, Pharmacy Services | Burlington |
| Remedy's Rx Progressive Pharmacy, Pharmacy Services | Burlington |
| Remedy'sRx Pharmacy, Oakville - Lakeshore Rd E (Madill Health-Aid Pharmacy), Pharmacy Services | Oakville |
| Remembrance Day Ceremonies, Burlington | Burlington |
| Renascent, Toronto - Wright Centre | Toronto |
| Retire-At-Home Services, Oakville, Home Care Services | Oakville |
| Retired Teachers of Ontario, Halton District 15 - No Physical Address | Halton Region |
| Retired Women Teachers of Ontario, Rockwood - Mailing Address, Lydia Snow North Halton Branch | Halton North |
| Retirement Homes Regulatory Authority | Toronto Downtown Central |
| Retirement Homes Regulatory Authority, Ontario - Online Services, Find a retirement home in Ontario | Ontario |
| Rexall Pharma Plus, Burlington - Brant St, Pharmacy Services | Burlington |
| Rexall Pharma Plus, Burlington - Guelph Line, Pharmacy Services | Burlington |
| Rexall Pharma Plus, Burlington - New St, Pharmacy Services | Burlington |
| Rexall Pharmacy, Acton - Queen St E, Pharmacy Services | Halton Hills |
| Rexall Pharmacy, Milton - Derry Rd W, Pharmacy Services | Milton |
| Rexall Pharmacy, Oakville - Lakeshore Rd W, Pharmacy Services | Oakville |
| Rexall Pharmacy, Oakville - Maple Grove Rd, Pharmacy Services | Oakville |
| Richard III Society of Canada | Burlington |
| Ride With Care | Mississauga |
| Right at Home Canada, Burlington-Milton, In Home Care Services | Burlington |
| Right at Home Canada, Oakville, In-Home Care Services | Oakville |
| Right at Home Canada, Halton Hills, In-Home Care Services | Halton Hills |
| River Glen Pharmacy, Pharmacy Services | Oakville |
| River Oaks Community Church | Oakville |
| River Oaks Medical Pharmacy, Pharmacy Services | Oakville |
| ROCK, Burlington ROCK Hub - Burloak, Our Community Cares - Food Pantry | Burlington |
| ROCK, Burlington ROCK Hub - Warwick, Our Community Cares - Food Pantry | Burlington |
| Roedean Cooperative Homes, John Scott Building | Oakville |
| Rogers Connected for Success | Toronto |
| Routes Adventures | Kingston |
| Royal Botanical Gardens | Burlington |
| Royal Botanical Gardens, Volunteer Program | Burlington |
| Royal Canadian Legion, Acton - Branch 197 | Acton |
| Royal Canadian Legion, Georgetown - Branch 120 | Georgetown |
| Royal Canadian Legion, Burlington - Branch 60 | Burlington |
| Royal Canadian Legion, Milton - Branch 136 | Milton |
| Royal Canadian Legion, Oakville - Branch 114 | Oakville |
| Royal Canadian Legion, Oakville - Bronte Branch 486 | Oakville |
| Royal Canadian Legion, Acton - Branch 197, Ladies Auxiliary | Acton |
| Royal Canadian Legion, Burlington - Branch 60, Ladies Auxiliary | Burlington |
| Royal Canadian Legion Branch 120, Georgetown - Branch 120, Ladies Auxiliary | Georgetown |
| Royal Canadian Naval Benevolent Fund, Ottawa | Ottawa |
| Royal Scottish Country Dance Society, Burlington (Ontario) Branch - Mailing Address | Burlington |
| RT Med Home Healthcare | Mississauga |
| Rural Ottawa South Support Services, Telephone Service, A Friendly Voice | Ontario |
