| One Forest Network Society | ST-Joseph-De-Madawaska | $6,550 |
| One Girl Can Society | Coquitlam | $1.1M |
| ONE Global (Canada) | Ottawa | $440K |
| One Heart Center for Humanity | Winnipeg | $1,926 |
| One Holy Catholic Apostolic Church Saint John Theologian True Orthodox Confession | Mann's Mountain | — |
| One Hope Community Church | Maple Ridge | $728K |
| One Hope Ministries of Canada Alberta Branch | Winnipeg | $36K |
| One Hope Ministries of Canada | Bentley | $467K |
| One Hope Ministries of Canada | Bonanza | — |
| One Hope Ministries of Canada (British Columbia Branch) | Winnipeg | $3.2M |
| One Hope Ministries of Canada | Dauphin | $512K |
| One Hope Ministries of Canada | Derby Junction | $113K |
| One Hope Ministries of Canada | Dumfries | $146K |
| One Hope Ministries of Canada | Fairview | $250K |
| One Hope Ministries of Canada | Gunn | $279K |
| One Hope Ministries of Canada | Hampton | $249K |
| One Hope Ministries of Canada | Margaree Valley | $204K |
| One Hope Ministries of Canada Ontario Branch | Winnipeg | $813K |
| One Hope Ministries of Canada (Quebec) | Magog | $496K |
| One Hope Ministries of Canada | Roseau River | $1.4M |
| One Hope Ministries of Canada | Vilna | $27K |
| One Hope Ministries of Canada | Willingdon | $19K |
| One Hope Ministries of Canada | Winnipeg | $8.1M |
| One Hope Ministries of Canada | Winnipeg | $0 |
| One Hope Ministries of Canada | Winnipeg | $6.3M |
| One Hundred Mile House Food Bank Society | 100 Mile House | $302K |
| One Hundred Mile House Pastoral Charge | 100 Mile House | $36K |
| One in Christ Community Association of Alberta | Edmonton | $9,831 |
| One! International Poverty Relief | Sher. Park | $128K |
| One Kids Place Children's Medical Treatment Centre of North East Ontario | North Bay | $12M |
| One Life Church (Lethbridge) | Lethbridge | $522K |
| One Life Makes a Difference | Regina | $4.8M |
| One Life One Chance Ministries | Chilliwack | $954K |
| One Little Goat Theatre Company Inc. | Toronto | $54K |
| One Living Hope Foundation | Toronto | $36K |
| One Love Africa Foundation | Victoria | $53K |
| One Love Animal Sanctuary | Mundare | — |
| One Love Outreach Guyana | Ottawa | — |
| One More Candle Inc. | Winnipeg | $4,932 |
| One More Time | New Westminster | $43K |
| One Parent Families Association of Canada l'Association des Familles Uni-Parental du Canada | Kingston | $14K |
| One Plane Away Donations | Iqaluit | $70K |
| One School One Farm Shelterbelt Project | Saskatoon | $70K |
| One Spark | Burlington | $14K |
| One Step Learning Opportunities Centre | Edmonton | $45K |
| One Straw Society | Roberts Creek | $488K |
| One-To-One International Inc. | Saskatoon | $24K |
| One to One Literacy Society | Vancouver | $414K |
| One Touch for All Nations Fellowship | Edmonton | $12K |
| One Trunk Theatre Inc. | Winnipeg | $108K |
| One Voice Chorus Society | Calgary | $86K |
| One Voice One Team Youth Leadership Organization | Brampton | $1.4M |
| One Way Club Society | Maple Ridge | $181K |
| One Way Ministries | Nepean | $1.4M |
| One with God Community | Markham | $107K |
| One World Arts | Ottawa | $3,210 |
| One World Missions Outreach | Etobicoke | $2,250 |
| One World Schoolhouse Foundation | Guelph | $42K |
| One World Two Eyes | Kelowna | $18K |
| One Yellow Rabbit Creative Capital Foundation | Calgary | $90K |
| One Yellow Rabbit Theatre Association | Calgary | $1.3M |
| ONE22 Ministries | Strathroy | $111K |
| One4Another International | Waterloo | $1.1M |
| One88 Community Church Mennonite Brethren Inc. | Winnipeg | — |
| Oneability Foundation | Victoria | $76K |
| OneAim Education Society | Vancouver | $0 |
| Oneball Charitable Cancer Organization | Calgary | $18K |
| Onechild Network & Support Inc | Richmond Hill | $425K |
| OneChurch.ca | Carlyle | $241K |
| OneChurch.to | Toronto | $3.9M |
| Oneday Dreams | Tecumseh | $127K |
| Onedonate | Calgary | $0 |
| Oneg Shabbos Congregation | Montreal | $70K |
| Oneida House of Prayer | Southwold | — |
| Oneida United Church | Hagersville | $89K |
| Oneiro Charitable Foundation | Aurora | $617K |
| Onelight Theatre Society | Halifax Cro | — |
| OneMeal Inc. | Halifax | — |
| Oneness Apostolic Church of North Bay | North Bay | $72K |
| Oneness Education Foundation | Mississauga | $38K |
| Oneness Pentecostal Church | Brantford | $64K |
| Oneness - World Communications | Ottawa | $556K |
| OneProsper International Inc. | Ottawa | $188K |
| OneRelief Community Services | Scarborough | $2,698 |
| One's Sikh Centre Inc. | Regina | $91K |
| OneSight EssilorLuxottica Foundation | Saint-Laurent | $692K |
| Onesimus Global Foundation | Green Valley | $1.2M |
| OneSky Community Resources Society | Penticton | $15.5M |
| OneSky Foundation (Canada) Inc. | Burnaby | $797K |
| Onesky Legacy Foundation | Penticton | $85K |
| Onetree Foundation | Victoria | $21K |
| OneVillage Community Service Foundation | Vancouver | — |
| Ong Adonai-Canada | Trois-Rivieres | $8,000 |
| Ongwanada Developmental Services | Kingston | $54M |
| Onion Lake Full Gospel Church Inc. | Onion Lake | $93K |
| Only Believe Ministries Inc. | ST. Thomas | $1,000 |
| Only Jesus Evangelical Team Incorporated | Kamloops | $34K |
| Only Jesus Global Missions | Calgary | $869 |
| Only Jesus Presbyterian Church | Vancouver | $23K |
| Onnuri Church | Langley | $597K |
| Onoway and District Historical Guild | Onoway | $178K |
| Onoway Baptist Church | Onoway | $194K |
| Onoway Golden Club | Onoway | $32K |
| Onoway Pastoral Charge | Alberta Beach | $86K |
| Onslow Belmont Fire Brigade | Belmont | $532K |
| Onstage Performance Group | Barrie | $19K |
| Ontario 4-H Council | Guelph | $2M |
| Ontario 4-H Foundation | Glencoe | $750K |
| Ontario Aboriginal Hiv/aids Strategy | Barrie | $2.8M |
| Ontario Agri-Food Education Inc. | Milton | $1.3M |
| Ontario Ahmadiyya Anjuman Isha'at Islam (lahore) | North York | $15K |
| Ontario AIDS Network | Toronto | $2.9M |
| Ontario Art Education Association | Toronto | $27K |
| Ontario Arts Council | Toronto | $63.7M |
| Ontario Arts Foundation/fondation des Arts de l'Ontario | Toronto | $7.2M |
| Ontario Association for Families of Children With Communication Disorders | ST Thomas | $322 |
| Ontario Association for Infant and Child Development | Whitby | $40K |
| Ontario Association for Mathematics Education Association Ontarienne pour l'Enseignement des Mathematiques | Town of Plympton Wyoming | $107K |
| Ontario Association For Suicide Prevention | Williamstown | — |
| Ontario Association of Architects Trust Fund | North York | $57K |
| Ontario Association of Art Galleries | Toronto | $476K |
| Ontario Association of Childrens Aid Societies | Toronto | $11.5M |
| Ontario Association of Crime Stoppers | Bracebridge | $264K |
| Ontario Association of Food Banks | Toronto | $26.4M |
| Ontario Association of Interval and Transition Houses | Midhurst | $807K |
| Ontario Association of Physics Teachers | ST Catharines | $19K |
| Ontario Association of Residences Treating Youth | Havelock | $147K |
| Ontario Association of the Deaf | North York | — |
| Ontario Association of Youth Employment Centres | North York | $4.4M |
| Ontario Aviation Historical Society | STN. Cheltenham | $310K |
| Ontario Band Association | Pickering | $244K |
| Ontario Bar Association Foundation | Toronto | $31K |
| Ontario Bethel Park Bible Camp Society | Kitchener | $651K |
| Ontario Bird Banding Association | Kanata | $3,484 |
| Ontario Black History Society | Toronto | — |
| Ontario Brain Injury Association | ST Catharines | $1.8M |
| Ontario Brain Institute Foundation | Toronto | $85K |
| Ontario Branch of the International Order of the King's Daughters and Sons | Ottawa | $5,650 |
| Ontario Canine Spay Neuter Task Force | Union | $9,845 |
| Ontario Centre d'Artistes | Sudbury | $275K |
| Ontario Centre for Ecology | ST Catharines | — |
| Ontario Cerebral Palsy Sports Association | Ottawa | $1M |
| Ontario Chapel British Methodist Episcopal Church of Canada | Windsor | $42K |
| Ontario Christian Assembly Incorporated | Selkirk | $355K |
| Ontario Christian Family Life Foundation | Toronto | — |
| Ontario Christian Gleaners | Cambridge | $1.7M |
| Ontario Christian Gospel Center | North York | $317K |
| Ontario Christian Missionary Conference | Simcoe | $1,400 |
| Ontario Christian Missionary Fellowship | Bowmanville | — |
| Ontario Church of God in Christ | Windsor | $131K |
| Ontario Circuit 10A of Jehovah's Witnesses | Deep River | — |
| Ontario Circuit 10B of Jehovah's Witnesses | Ottawa | — |
| Ontario Circuit 10C of Jehovah's Witnesses | Nepean | — |
| Ontario Circuit 11A of Jehovah's Witnesses | Timmins | — |
| Ontario Circuit 11B of Jehovah's Witnesses | Sudbury | — |
| Ontario Circuit 11C of Jehovah's Witnesses | Northbay | — |
| Ontario Circuit 12A of Jehovah's Witnesses | Thunder Bay | — |
| Ontario Circuit 12B of Jehovah's Witnesses | Sault Ste. Marie | — |
| Ontario Circuit 12C of Jehovah's Witnesses | Espanola | — |
| Ontario Circuit 13A of Jehovah's Witnesses | Barrie | — |
| Ontario Circuit 13B of Jehovah's Witnesses | Seguin | — |
| Ontario Circuit 14A of Jehovah's Witnesses | Mississauga | — |
| Ontario Circuit 14B of Jehovah's Witnesses | Mississauga | — |
| Ontario Circuit 15A of Jehovah's Witnesses | Ancaster | — |
| Ontario Circuit 15B of Jehovah's Witnesses | Oakville | — |
| Ontario Circuit 16A of Jehovah's Witnesses | Kemptville | — |
| Ontario Circuit 16B of Jehovah's Witnesses | Gloucester | — |
| Ontario Circuit 16C of Jehovah's Witnesses | Gloucester | — |
| Ontario Circuit 17A of Jehovah's Witnesses | Bowmanville | — |
| Ontario Circuit 17B of Jehovah's Witnesses | Jackson's Point | — |
| Ontario Circuit 18A of Jehovah's Witnesses | Kitchener | — |
| Ontario Circuit 18B of Jehovah's Witnesses | Waterloo | — |
| Ontario Circuit 19B of Jehovah's Witnesses | Oakville | — |
| Ontario Circuit 1A of Jehovah's Witnesses | Bolton | — |
| Ontario Circuit 1B of Jehovah's Witnesses | Caledon Village | — |
| Ontario Circuit 20B of Jehovah's Witnesses | Orleans | — |
| Ontario Circuit 20C of Jehovah's Witnesses | Iroquois | — |
| Ontario Circuit 21B of Jehovah's Witnesses | Toronto | — |
| Ontario Circuit 2A of Jehovah's Witnesses | Etobicoke | — |
| Ontario Circuit 2B of Jehovah's Witnesses | East York | — |
| Ontario Circuit 3A of Jehovah's Witnesses | Scarborough | — |
| Ontario Circuit 3B of Jehovah's Witnesses | Scarborough | — |
| Ontario Circuit 4A of Jehovah's Witnesses | Beamsville | — |
| Ontario Circuit 4B of Jehovah's Witnesses | Welland | — |
| Ontario Circuit 5A of Jehovah's Witnesses | Mountain Grove | — |
| Ontario Circuit 5B of Jehovah's Witnesses | Kingston | — |
| Ontario Circuit 6A of Jehovah's Witnesses | London | — |
| Ontario Circuit 6B of Jehovah's Witnesses | Tillsonburg | — |
| Ontario Circuit 7A of Jehovah's Witnesses | Windsor | — |
| Ontario Circuit 7B of Jehovah's Witnesses | Sarnia | — |
| Ontario Circuit 8A of Jehovah's Witnesses | Cambridge | — |
| Ontario Circuit 8B of Jehovah's Witnesses | Waterloo | — |
| Ontario Circuit 9A of Jehovah's Witnesses | Owen Sound | — |
| Ontario Circuit 9B of Jehovah's Witnesses | Fergus | — |
| Ontario Clean Air Alliance Research Inc. | Toronto | $398K |
| Ontario College of Art & Design Foundation | Toronto | — |
| Ontario College of Art & Design University Universite de l'Ecole d'Art et de Design de l'Ontario | Toronto | $112.9M |
| Ontario College of Teachers Foundation | Toronto | $6,000 |
| Ontario Colleges Athletic Association | Scarborough | $1.6M |
| Ontario Community Emergency Assistance Program | Cobourg | $15K |