| O a C Alumni Foundation | Guelph | $1.4M |
| O.b.a.d. the Organization for Bipolar Affective Disorders Society | Calgary | $153K |
| O.C.C. Our Children's Centre Society of Greater Victoria | Victoria | $1M |
| O.E.I. Onsite Education Inc. | Holland Landing | $81K |
| O.E. Smith Trust | Halifax | $641K |
| O.j. Jacobson Foundation | Abbotsford | $30K |
| O.k. Before and After School Child CARE Centres Inc. | Winnipeg | $3M |
| O K Charitable Trust | Lethbridge | $149K |
| O.k. Mini School Society | Okanagan Falls | — |
| O. Koshetz Choir Inc. | Winnipeg | $33K |
| O.L.P.H. Parent-School Education Future Fund | Toronto | $110K |
| O.M.K. Animal Shelter Ltd. | Ponoka | $239K |
| O.N.G Vida Jardin De Din Des Orphelins | North York | $7,700 |
| O.R.C.C.A. Dental Clinic Society | Sidney | $245K |
| O.s.j. Charities Trust Fund | Whitby | $180K |
| O.T.J. de St-Romain de Frontenac (1965) Inc. | ST Romain | $160K |
| O.t.j. Petit-Saguenay | Petit-Saguenay | $447K |
| Ô Travail de Rue Etc (OTRE) | Joliette | $727K |
| O Vertigo Danse Inc. | Montreal | $928K |
| Oak Acres Childrens Foundation Inc | Charlottetown | $259K |
| Oak and Elm Grove Cemetery Company | Centreville Kings County | $197K |
| Oak Avenue Neighbourhood Hub Society | Surrey | $841K |
| Oak Bay Fire Fighters Charitable Foundation | Victoria | $141K |
| Oak Bay Gospel Assembly | Victoria | $85K |
| Oak Bay Kiwanis Health CARE Society | Victoria | $13.8M |
| Oak Bay Kiwanis Pavilion Foundation | Victoria | $66K |
| Oak Bay Kiwanis Rose Manor Society | Victoria | $1.8M |
| Oak Bay (parent-Owned) Pre-School | Victoria | $75K |
| Oak Bay Rural Cemetery | ST. Stephen | $13K |
| Oak Bay Sea Rescue Society | Victoria | $46K |
| Oak Bay United Church | Victoria | $429K |
| Oak Bay Volunteer Services Society | Victoria | $341K |
| Oak Bluff Bible Church Inc. | Oak Bluff | $385K |
| Oak Bluff Charitable Trust | Morris | $57K |
| Oak Bluff Nursery School Inc. | Oak Bluff | $1M |
| Oak Bridge Academy | Cambridge | $3.3M |
| Oak Centre: Alternative Community Support | Welland | $693K |
| Oak Counselling Services Society | Vancouver | $78K |
| Oak Hill Academy | Copetown | $2.5M |
| Oak Hill Cemetery Company | Lequille | $2,444 |
| Oak Hill Foundation | Bon Accord | $9.3M |
| Oak Hill United Church | Scotch Ridge | — |
| Oak Lake Agricultural Society | Oak Lake | $33K |
| Oak Lake and Area Donor's Choice | Oak Lake | $5,390 |
| Oak Lake & Area Foundation Inc. | Oak Lake | $90K |
| Oak Lake & Area Garden Club | Oak Lake | $1,989 |
| Oak Lake Beach Playground Committee | Oak Lake | — |
| Oak Lake Care Centre Inc. | Oak Lake | $522K |
| Oak Lake & District Museum Inc. | Oak Lake | $5,934 |
| Oak Lake Mennonite Church | Oak Lake | $32K |
| Oak Lake United Church | Oak Lake | $36K |
| Oak Meadows Christian Schools Inc. | Oakville | $5.2M |
| Oak Park Church of Christ | Calgary | $888K |
| Oak Park CO-Operative Children's Centre Inc. | London | — |
| Oak Park Lodge Inc. | Woodlands | $250K |
| Oak Park Neighbourhood Centre | Oakville | $1.1M |
| Oak Ridge Charitable Trust | Brandon | $4,520 |
| Oak Ridges Christian Fellowship Foundation | Richmond Hill | $17K |
| Oak Ridges Church | Stouffville | $145K |
| Oak Ridges Hospice of Durham Ltd. | Port Perry | $2.5M |
| Oak Ridges Moraine Foundation | Toronto | $41K |
| Oak Ridges Moraine Land Trust | Schomberg | $925K |
| Oak Ridges Trail Association | Aurora | $43K |
| Oak River Charitable Trust | Brandon | $94K |
| Oak River Community Association Inc. | Oak River | $62K |
| Oak River Pastoral Charge | Oakriver | $17K |
| Oak Street Nursery School Inc. | Winnipeg | $351K |
| Oak Table Inc. | Winnipeg | $1.2M |
| Oak Tree Foundation | Abbotsford | — |
| Oak Valley Health | Markham | $407.3M |
| Oak Valley Productions Inc. | Manitou | $135K |
| Oakbank Baptist Church Inc. | Oakbank | $288K |
| Oakbank Kids Korner Cooperative Inc | Oakbank | $778K |
| Oakbank - Springfield Kinsmen Senior's Complex Inc. | Oakbank | $936K |
| Oakbank United Church | Oakbank | $303K |
| Oakbrook Foundation | Langley | $284K |
| Oakburn Game and Fish Association Inc. | Oakburn | $76K |
| Oakcity Church | North York | — |
| Oakdale Senior Housing Inc | Oak River | $94K |
| Oakfield Cemetery Association | Sydney | $10K |
| Oakhill and District Fire Department | Bridgewater | $436K |
| Oakland Cemetery Inc. | West Lorne | $54K |
| Oakland Scotland Community Church | Scotland | $171K |
| Oakland United Church Pastoral Charge | Corner Brook | $37K |
| Oaklands Chapel | Victoria | $310K |
| Oaklands Charitable Properties Foundation | Toronto | $5.3M |
| Oaklands Community Association | Victoria | $2.8M |
| Oaklane Charitable Trust | Lethbridge | $76K |
| Oakridge Bible Chapel | Oakville | $864K |
| Oakridge Church of Christ | Vancouver | $141K |
| Oakridge Fellowship Baptist Church | Vancouver | $422K |
| Oakridge Korean Congregation of Jehovah's Witnesses Vancouver British Columbia | Burnaby | $23K |
| Oakridge Lutheran Church | Vancouver | $321K |
| Oakridge Presbyterian Church | London | $1.2M |
| Oakridge Seniors' Society | Vancouver | $27K |
| Oakridge Spanish Congregation of Jehovah's Witnesses Vancouver British Columbia | Richmond | $34K |
| Oakridge United Church | Vancouver | $1.1M |
| Oaks of Righteousness Christian Fellowship | Severn | — |
| Oakville Cemetery Association | Oakville | $35K |
| Oakville Chamber Orchestra | North York | $81K |
| Oakville Chinese Evangelical Missionary Church | Mississauga | — |
| Oakville Chinese Hope Church | Oakville | $318K |
| Oakville Church of the Nazarene | Oakville | $550K |
| Oakville Community Club Inc. | Oakville | $1.3M |
| Oakville Community FIRST Robotics Team Inc. | Oakville | $95K |
| Oakville Community Foundation | Oakville | $29.4M |
| Oakville Family YMCA | Oakville | $28.5M |
| Oakville Fellowship Church Corporation | Oakville | $37K |
| Oakville Galleries | Oakville | $1.2M |
| Oakville Grace Alliance Church | Oakville | $129K |
| Oakville Historical Society | Oakville | $69K |
| Oakville Hospital Foundation | Oakville | $20.1M |
| Oakville Hospital Volunteer Association | Oakville | $2M |
| Oakville Kiwanis Charitable Foundation | Oakville | — |
| Oakville Korean Church | Oakville | — |
| Oakville Meals On Wheels | Oakville | $712K |
| Oakville & Milton Humane Society | Oakville | $6.3M |
| Oakville Parent-Child Centre | Oakville | $2.6M |
| Oakville Silver Threads Seniors Inc. | Oakville | $38K |
| Oakville Suzuki Association | Oakville | $171K |
| Oakville Symphony Youth Orchestra | Oakville | $216K |
| Oakville United Church | Oakville | $39K |
| Oakville United Pentecostal Church | Port Dover | — |
| Oakville Vocal Arts Festival | Oakville | $16K |
| Oakville Wind Orchestra | Oakville | $37K |
| Oakvillegreen Conservation Association Inc. | Oakville | $267K |
| Oakwood Baptist Church | Toronto | $125K |
| Oakwood Bible Chapel 8 | Windsor | $382K |
| Oakwood Children's House | Toronto | $346K |
| Oakwood Congregation of Jehovah's Witnesses Toronto Ontario | York | $35K |
| Oakwood Gospel Hall | Welland | $41K |
| Oakwood Terrace Foundation | Dartmouth | $368K |
| Oakwood United Church | Oakwood | $37K |
| Oakwood Vaughan Community Organization | Toronto | $113K |
| Oakwood Wesleyan Church | Toronto | $422K |
| Oasis: A Centre For Bereavement And Healing | Newmarket | $6,366 |
| Oasis Addiction Recovery Society | Toronto | — |
| Oasis Centre des Femmes Inc. | Toronto | $2M |
| Oasis Christian Centre | Sherbrooke | $262K |
| Oasis Christian Ministries International | Abbotsford | $16K |
| Oasis City Church Society | Duncan | $908K |
| Oasis Community Church Inc. | Winnipeg | $4.5M |
| Oasis de la Ferme Sainte-Famille | Gatineau | $114K |
| Oasis de l'Etoile | Plantagenet | $49K |
| Oasis du bel âge | Aguanish | $241K |
| Oasis Dufferin Community Centre | Toronto | $397K |
| Oasis Fertility Support Network | Barrie | $29K |
| Oasis Foundation | Vancouver | $4.2M |
| OASIS Initiative Canada | Toronto | $215K |
| Oasis Legacy Foundation | Vernon | — |
| Oasis Mennonite Church | Brunner | $200K |
| Oasis Ministry for a Course in Miracles | Ottawa | $37K |
| Oasis of Hope Community Church | Kingston | $43K |
| Oasis of Life Church Connectional Edmonton | Edmonton | — |
| Oasis of Love and Miracles | Edmonton | $48K |
| Oasis of Love Ministries Inc. | Assiniboia | $85K |
| Oasis of Love Toronto | North York | $36K |
| Oasis of Peace Global Fellowship | Selkirk | $42K |
| Oasis of Praise Christian Ministries International | Maple | — |
| Oasis Pentecostal Church | Kamloops | $697K |
| Oasis pour adultes handicapés de Lévis | Levis | $825K |
| Oasis Project Africa Education Society. | Sherwood Park | — |
| Oasis santé mentale Granby et région | Granby | $808K |
| Oasis Society for the Spiritual Health of Victoria | Victoria | $544K |
| Oasis South Shore Church | Sainte-Julie | $223K |
| Oasis Unité Mobile d'Intervention | Laval | $1.2M |
| Oasis United Church | Pentiction | $256K |
| Oasis Victory Church Inc. | Cap Pele | $148K |
| Oasis Youth Care Programs | Oakville | $244K |
| OB Charitable Trust | Lethbridge | $20K |
| Obair Economic Society | Dawson Creek | $1.1M |
| Obasi Children Foundation Ltd. | Calgary | $1,410 |
| OBAT Canada | Orleans | $1.2M |
| Ober Family Foundation | Toronto | $2,346 |
| Obesity Canada | Edmonton | $1.4M |
| Obioma Relief Organization of Canada | Forest | — |
| Objectif Bienveillance | Chapais | $104K |
| Objectif Jeunes Fondation de l'Ecole Charles Perrault de Laval | Laval | $45K |
| Oblate Fathers of Assumption Province | Toronto | — |
| Oblates of Mary Immaculate | Ottawa | $745K |
| Oblates of Mary Immaculate | Ottawa | $388K |
| Oblates of Mary Immaculate | Ottawa | $1.8M |
| Oblates of Mary Immaculate | Ottawa | — |
| Oboro Goboro | Montreal | $857K |
| O'Brien Farm Foundation Incorporated | ST. John's | $238K |
| O'Brien/jackson Family Foundation | Belle River | $4,783 |
| Observatoire de la Geosphere de Charlevoix | La Malbaie | $7,206 |
| Observatoire des requins du Saint-Laurent St. Lawrence Shark Observatory | Drummondville | $54K |
| Observatoire québécois des inégalités | Montreal | $1.1M |
| Observatory of the Family | Etobicoke | — |
| Observer Publications Inc. | Toronto | $1.8M |
| Obsessive Compulsive Disorder Canada | Toronto | — |
| Obsidian Theatre Company Inc. | Toronto | $1.3M |
| OCAD U CO Foundation | Toronto | $55K |
| Ocama Collective | York | $37K |
| OCASI - Ontario Council of Agencies Serving Immigrants | Toronto | $7M |
| Occa Communities Association | Kelowna | $731K |
| Ocd Centre Manitoba Inc. | Winnipeg | — |
| Ocean Ambassadors Canada | North Vancouver | $299K |
| Ocean Park Community Association | Surrey | $52K |