| Rainbow Health Ontario | Toronto Downtown East |
| Rapid Addiction Treatment Centre, Medical Treatment and Counselling for Addictions | Clarkson |
| Re:Soul Youth Centre, Milton | Milton |
| Rebecca Medical Walk In Clinic, Walk-in Medical Clinic | Oakville |
| rEcess Oakville | Oakville |
| Region of Halton Dart League | Georgetown |
| Re-Imagine Ontario, Community Support Services for Vulnerable Youth and Seniors | Halton Region |
| Renascent, Toronto - Wright Centre | Toronto |
| Restorations Second Stage Homes, Burlington - Unpublished address, Nancy's House | Burlington |
| Ringette Association of Burlington | Burlington |
| Rise | Toronto |
| Robbie's Rainbow | Oakville |
| ROCK, Burlington - Head Office, Community Mental Health Services | Burlington |
| ROCK, Acton Office | Acton |
| ROCK, Autism and Behavioural Services | Halton Region |
| ROCK, Burlington - Aberdeen House, Live-in Treatment | Burlington |
| ROCK, Burlington - Cumberland Ave, EarlyON Child and Family Centre | Burlington |
| ROCK, Access and System Navigation | Halton Region |
| ROCK, Danielle's Place - Eating Disorder Support and Resource Centre | Burlington |
| ROCK, Halton Coordinated Service Planning | Burlington |
| ROCK, Queer@ROCK | Halton Region |
| ROCK, Burlington - Mobile Services, EarlyON Child and Family Centre | Burlington |
| ROCK, Burlington - St Mark, EarlyON Child and Family Centre | Burlington |
| ROCK, Burlington ROCK Hub - Burloak, Our Community Cares - Food Pantry | Burlington |
| ROCK, Burlington ROCK Hub - Burloak, Our Community Cares - Infant Supplies | Burlington |
| ROCK, Burlington ROCK Hub - Burloak, Our Community Cares | Burlington |
| ROCK, Burlington ROCK Hub - Warwick, Our Community Cares - Food Pantry | Burlington |
| ROCK, Burlington ROCK Hub - Warwick, Our Community Cares - Infant Supplies | Burlington |
| ROCK, Burlington ROCK Hub - Warwick, Our Community Cares | Burlington |
| ROCK, Georgetown Office | Georgetown |
| ROCK, Group Based Mental Health Services | Halton Region |
| ROCK, Individualized Mental Health Services | Halton Region |
| ROCK, Milton Office | Milton |
| ROCK, Nelson Youth Centre | Burlington |
| Rolling Horse Community Cycle | Burlington |
| Ronald McDonald House Charities Toronto | Toronto Downtown Central |
| Roots Community Services | Brampton |
| Roseland Park Country Club | Burlington |
| Rotary International, Rotary Burlington Lakeshore | Burlington |
| Royal Botanical Gardens, Discovery Day Camps | Burlington |
| Royal Canadian Air Cadets, Acton - 197 Typhoon Squadron | Acton |
| Royal Canadian Air Cadets, Georgetown - 756 Wild Goose Squadron | Georgetown |
| Royal Canadian Air Cadets, Burlington - 715 Mohawk Squadron | Burlington |
| Royal Canadian Air Cadets, Milton - 820 Chris Hadfield Squadron | Milton |
| Royal Canadian Air Cadets, Oakville - 540 Golden Hawks Squadron | Oakville |
| Royal Canadian Army Cadets, Georgetown - 676 Lorne Scots | Georgetown |
| Royal Canadian Army Cadets, Burlington - 2379 Royal Hamilton Light Infantry | Burlington |
| Royal Canadian Army Cadets, Milton - 2990 Lorne Scots | Milton |
| Royal Canadian Army Cadets, Oakville - 1188 Lorne Scots | Oakville |
| Royal Canadian Sea Cadets, Burlington - 65 RCSCC Iron Duke | Burlington |
| Royal Canadian Sea Cadets, Oakville, Oakville Sea Cadets - RCSCC Oakville | Oakville |
| Royal City Soccer Club, Summer Soccer Camps | Burlington |
