| Raider Wildlife Control, Hoarding and Clutter Clean-up Services | Hamilton |
| Rainbow Health Ontario | Toronto Downtown East |
| Ray Pharmacy, Pharmacy Services | Oakville |
| Re:Soul Youth Centre, Milton | Milton |
| Real Estate Council of Ontario | Toronto |
| Realm Medical Clinic, Walk-in Medical Clinic | Burlington |
| Rebecca Medical Walk-In Clinic, Walk-in Medical Clinic | Oakville |
| reBOOT Canada | Toronto |
| Rebounders Canada, Peer Support for Adult Survivors of Childhood Cancer | Toronto |
| rEcess Oakville | Oakville |
| Redhill Church | Milton |
| Redleaf Cultural Integration, Burlington Chinese Community Connection | Burlington |
| Region of Halton Dart League | Georgetown |
| Registered Massage Therapists' Association of Ontario | Etobicoke |
| 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 |
| Remembrance Day Ceremonies, Halton Region | Halton Region |
| Renascent, Toronto - Wright Centre | Toronto |
| Renewed Computer Technology, RCTech Outreach | Mississauga |
| Reproductive Care Centre (The), Fertility Clinic | Oakville |
| Resilient Kids Canada, Online/Web Service | Burlington |
| Responsible Gambling Council, Outreach and Prevention | Toronto |
| Ressel School @ Willowbrae Academy, Licensed Child Care Centre | Burlington |
| Restorations Second Stage Homes, Burlington - Unpublished address, Nancy's House | Burlington |
| 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 |
| Rick Hansen Foundation, The Rick and Amanda Hansen Scholarship for Youth with Disabilities | Richmond |
| 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 |
| Ringette Association of Burlington | Burlington |
| Ripple Effect Wellness Organization (The), Wellness & Health Education | Mississauga |
| Rise, Toronto | Toronto |
| River Glen Pharmacy, Pharmacy Services | Oakville |
| River Oaks Community Church | Oakville |
| River Oaks Medical Pharmacy, Pharmacy Services | Oakville |
| 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, Burlington - Head Office, FASD Services | Halton Region |
| 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 |
| ROCK, Oakville Office | Oakville |
| Roedean Cooperative Homes, John Scott Building | Oakville |
| Rogers Connected for Success | Toronto |
| Rolling Horse Community Cycle | Burlington |
| Ronald McDonald House Charities Toronto | Toronto Downtown Central |
| Roots Community Services, BAC Community Support Line | Brampton |
| Roots Community Services | Brampton |
| Roseland Park Country Club | Burlington |
| Rotary International, Rotary Club of Acton / Rockwood | Acton |
| Rotary International, Rotary Club of Georgetown | Georgetown |
| Rotary International, Rotary Club of Burlington | Burlington |
| Rotary International, Rotary Burlington Lakeshore | Burlington |
| Rotary International, Rotary Club of Burlington Central | Burlington |
| Rotary International, Rotary Club of Burlington North | Burlington |
| Rotary International, Milton Rotary | Milton |
| Rotary International, Rotary Club of Oakville Trafalgar | Oakville |
| Rotary International, Rotary Club of Oakville West | Oakville |
| Rotary International, Rotary Club of Oakville | Oakville |
| Rotary International, Rotary Club of Acton/Rockwood - Acton Trunk Sale | Acton |
| Rotary International, Rotary Club of Central Burlington - Rotary Memorial Forest | Burlington |
| Rotherglen School, Oakville Elementary Campus | Oakville |
| Rotherglen School, Oakville Primary Campus | Oakville |
| Routes Adventures | Kingston |
| Royal Botanical Gardens | Burlington |
| Royal Botanical Gardens, Discovery Day Camps | Burlington |
| Royal Botanical Gardens, Rental Facilities | Burlington |
| Royal Botanical Gardens, Volunteer Program | Burlington |
| Royal Botanical Gardens, Christmas Tree Drop-Off | 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 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 Mounted Police, Milton - Toronto West Detachment | Milton |
| Royal Canadian Naval Benevolent Fund, Ottawa | Ottawa |
| 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 |
| Royal College of Dental Surgeons of Ontario | Toronto Downtown North |
| 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 |
