| | Organization Name(s) | Located In |
 | R H L I Heritage Museum, Royal Hamilton Light Infantry | Hamilton Central |
| R Samuel Mclaughlin Centre for Research and Education In Aging and Health | Hamilton West |
| Raiders Volleyball Club | Waterdown |
| Rainbow Senior | Hamilton Mountain West |
| Raising Our Children's Kids | Hamilton East |
| Rambynas Incorporated Hamilton District Senior Citizens Home | Hamilton West |
| Ramgarhia Association Hamilton | Stoney Creek |
| Rangatang Skateboard Park and Pro Shop, Day Camp Programs | Hamilton East |
| Razavi Islamic Centre, Shia Muslims | Hamilton Mountain East |
| RE-Create Outreach Art Studio | Hamilton Central |
| Reach for the Rainbow | Toronto |
| Reach Forth Sports Ministry | Ancaster |
| Real Estate Council of Ontario | Toronto |
| Realtors Association of Hamilton-Burlington | Hamilton Central |
| Rebekah Lodge, Lynda 374 | Troy |
| | Rebounders Canada | Oakville |
| Recovering Couples Anonymous | Hamilton Central |
| Recovery International, Hamilton Mountain Location | Hamilton Mountain East |
| Recovery International, West Hamilton Location | Hamilton West |
| Recycling Council of Ontario | Toronto |
| | Red Hat Society | Hamilton (City of) |
| Redeemer Lutheran Church | Hamilton East |
| Redeemer University College | Ancaster |
| Redeemer University College, College Athletic Centre, Bed and Breakfast Program, Conference Services, Accommodations | Ancaster |
| Redeemer University College, Redeemer Child Care Centre | Ancaster |
| Redeemer University College, Summer RAYS Sports Camp, Day Camp Programs | Ancaster |
| Reggina Social Club, Hamilton Branch | Hamilton Central |
| Regina Gardens | Hamilton Mountain West |
| Regina Mundi Roman Catholic Church | Hamilton Mountain West |
| Regional Joint Assessment Centre, Hamilton Site | Hamilton Mountain West |
| Registered Nurses Association of Ontario | Toronto |
| Rehoboth Christian School | Copetown |
| Rehoboth Church of Burlington Waterdown, Canadian Reformed Church | Burlington |
| Religious Society of Friends, Hamilton Meeting | Hamilton West |
| Reptile Store, Day Camp Programs | Hamilton Central |
| Residences on Augusta (The) | Hamilton Central |
| Resorts of Ontario | Orillia |
| Restoration House Hamilton | Hamilton Central |
| Retired Teachers of Ontario (The) | Toronto |
| | Retired Women Teachers of Ontario | Binbrook |
| | Retrouvaille, A Lifeline for Troubled Marriages, Retrouvaille Hamilton | Hamilton |
| Rhythm Factory (The) | Hamilton Mountain East |
| River Rock Church | Stoney Creek - Lower |
| Riverdale Seniors Punjabi Group | Stoney Creek - Lower |
| Riverwalk Country Day Montessori School | Millgrove |
| Robert Land Community Association | Hamilton East |
| Robert Land Community Association, Eva Rothwell Resource Centre | Hamilton East |
| Rock Chapel Golf Centre | Flamborough |
| Rock Chapel Golf Centre, Golf Academy, Day Camp Programs | Flamborough |
| Rock Chapel United Church | Flamborough |
| | Rockton Agricultural Society | Rockton |
| | Rockton Agricultural Society, Rockton Fairgrounds Hall | Rockton |
| | Rockton Agricultural Society, Rockton World's Fair | Rockton |
| Rockton Saddle Club | Cambridge |
| Rockton United Church, Rockton-Copetown Pastoral Charge | Flamborough |
| Rockton Winter Club | Rockton |
| | Rogers Centre, Disabled Services Coordinator (Guest Services) | Toronto |
| Roman Catholic Diocese of Hamilton, Chancery Office | Hamilton West |
| Roman Catholic Diocese of Hamilton, Office for Family Ministry Family and Religious Education | Hamilton West |
| Roman Catholic Diocese of Hamilton, Office for Family Ministry Family and Religious Education, Catholic Separated, Divorced and Widowed Self Help Groups | Hamilton West |
| Roman Catholic Diocese of Hamilton, Office for Refugees and Immigration | Hamilton West |
| Romanian Hall | Hamilton Central |
| Romanian Library | Hamilton Central |
| Romanian Museum | Hamilton Central |
| Ronald McDonald House | Hamilton West |
| | Rosedale Garden Club | Hamilton |
| Rosedale Minor Hockey Association | Hamilton East |
| Roselawn Lawnbowling Club | Hamilton East |
| Roseto Recreation Club | Hamilton Mountain East |
| Rosicrucian Order - AMORC | Hamilton East |
| Rotary Garden Court Apartments, Seniors Apartment | Waterdown |
| Rotary Haunted House, Waterdown | Waterdown |
| Rotary International, Ancaster Rotary Club AM | Ancaster |
| | Rotary International, Dundas Valley Sunrise Rotary Club | Dundas |
| | Rotary International, Flamborough Rotary Club AM | Flamborough |
| | Rotary International, Rotary Club of Dundas | Dundas |
| Rotary International, Rotary Club of Hamilton | Hamilton Central |
| Rotary International, Rotary Club of Ancaster | Ancaster |
| Rotary International, Rotary Club of Hamilton AM | Hamilton Central |
| Rotary International, Rotary Club of Hamilton East Wentworth | Stoney Creek |
| | Rotary International, Rotary Club of Hamilton Mountain | Hamilton |
| Rotary International, Rotary Club of Hamilton Sunset | Hamilton Central |
| | Rotary International, Rotary Club of Stoney Creek | Stoney Creek |
| Rotary International, Rotary Club of Waterdown | Waterdown |
| Routes to Learning Canada | Kingston |
| Royal Antediluvian Order of Buffalos, Wentworth Lodge No. 6 | Hamilton East |
| | Royal Astronomical Society of Canada, Hamilton Centre | Flamborough |
| | Royal Canadian Air Force Association, 431 - Krakow Wing | Hamilton |
| | Royal Canadian Air Force Association, Womens Division of Hamilton | Dundas |
| Royal Canadian Legion, Hamilton Branch 229, Tabs for Wheelchairs Program, Ryerson United Church Drop Off Location | Hamilton East |
| Royal Canadian Legion, Hamilton Branch 36 Dundas | Dundas |
| Royal Canadian Legion, Hamilton Branch 36 Dundas, Ladies Auxiliary | Dundas |
| Royal Canadian Legion, Hamilton Branch 551 Waterdown | Waterdown |
| Royal Canadian Legion, Hamilton Branch 551 Waterdown, Ladies Auxiliary | Waterdown |
| Royal Canadian Legion, Hamilton Branch 58 | Hamilton East |
| Royal Canadian Legion, Hamilton Branch 58, Ladies Auxiliary | Hamilton East |
| Royal Canadian Legion, Hamilton Branch 622 Battlefield, Ladies Auxiliary | Stoney Creek |
| | Royal Canadian Legion, Hamilton Branch Beverly 500 Lynden | Flamborough |
| Royal Canadian Legion, Hamilton Branch Mount Hamilton | Hamilton Mountain East |
| Royal City Soccer Club, Super Summer Soccer, Day Camp Programs | Hamilton Mountain West |
| Royal Hamilton Light Infantry | Hamilton Central |
| Royal Hamilton Light Infantry, Senior Citizens | Hamilton East |
| Royal Hamilton Yacht Club, Youth Sailing Program, Day Camp Programs | Hamilton Central |
| Royal Life Saving Society Canada, Ontario Branch, Civilian Honours and Awards | Toronto |
| | Royal Scottish Country Dance Society, Hamilton Branch | Hamilton (City of) |
| Ryerson Park Seniors Apartments | Ancaster |
| Ryerson United Church, Ancaster | Ancaster |
| Ryerson United Church, Hamilton | Hamilton East |
| Rygiel Supports for Community Living | Hamilton Mountain West |
| Rygiel Supports for Community Living, Passport | Hamilton Mountain West |
| Rymal Road Community Church | Stoney Creek - Upper |
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