| Ontario Community Justice Association (ocja) | Cobourg | — |
| Ontario Community Newspapers Foundation | Toronto | — |
| Ontario Community Support Association / Association Ontarienne de Soutien Communautaire | Toronto | $1.8M |
| Ontario Conference of Separated and Divorced Catholics | London | — |
| Ontario Conference of the Seventh-Day Adventist Church | Barrie | $572K |
| Ontario Conference of the Seventh-Day Adventist Church | Barrie | — |
| Ontario Conference of the Seventh-Day Adventist Church | Belleville | $390K |
| Ontario Conference of the Seventh-Day Adventist Church | Bowmanville | $678K |
| Ontario Conference of the Seventh-Day Adventist Church | Bracebridge | $113K |
| Ontario Conference of the Seventh-Day Adventist Church | Brampton | $857K |
| Ontario Conference of the Seventh-Day Adventist Church | Brampton | $1.6M |
| Ontario Conference of the Seventh-Day Adventist Church | Brantford | $356K |
| Ontario Conference of the Seventh-Day Adventist Church | Brockville | $211K |
| Ontario Conference of the Seventh-Day Adventist Church | Cambridge | $257K |
| Ontario Conference of the Seventh-Day Adventist Church | Carleton Place | $125K |
| Ontario Conference of the Seventh-Day Adventist Church | Chatham | $202K |
| Ontario Conference of the Seventh-Day Adventist Church | Cornwall | $167K |
| Ontario Conference of the Seventh-Day Adventist Church | Downsview | $1.3M |
| Ontario Conference of the Seventh-Day Adventist Church | Downsview | $1.3M |
| Ontario Conference of the Seventh-Day Adventist Church | Etobicoke | $344K |
| Ontario Conference of the Seventh-Day Adventist Church | Etobicoke | $741K |
| Ontario Conference of the Seventh-Day Adventist Church | Etobicoke | $671K |
| Ontario Conference of the Seventh-Day Adventist Church | Etobicoke | $271K |
| Ontario Conference of the Seventh-Day Adventist Church | Etobicoke | $581K |
| Ontario Conference of the Seventh-Day Adventist Church | Etobicoke | $277K |
| Ontario Conference of the Seventh-Day Adventist Church | Etobicoke | $882K |
| Ontario Conference of the Seventh-Day Adventist Church | Etobicoke | $969K |
| Ontario Conference of the Seventh-Day Adventist Church | Etobicoke | $3M |
| Ontario Conference of the Seventh-Day Adventist Church | Etobicoke | $88K |
| Ontario Conference of the Seventh-Day Adventist Church | Guelph | $252K |
| Ontario Conference of the Seventh-Day Adventist Church | Haileybury | $45K |
| Ontario Conference of the Seventh-Day Adventist Church | Hamilton | $783K |
| Ontario Conference of the Seventh-Day Adventist Church | Hamilton | $581K |
| Ontario Conference of the Seventh-Day Adventist Church | Harriston | $70K |
| Ontario Conference of the Seventh-Day Adventist Church | Hawkesbury | $166K |
| Ontario Conference of the Seventh-Day Adventist Church | Iron Bridge | $149K |
| Ontario Conference of the Seventh-Day Adventist Church | Kingston | $384K |
| Ontario Conference of the Seventh-Day Adventist Church | Kitchener | $544K |
| Ontario Conference of the Seventh-Day Adventist Church | Leamington | $179K |
| Ontario Conference of the Seventh-Day Adventist Church | London | $582K |
| Ontario Conference of the Seventh-Day Adventist Church | London | $459K |
| Ontario Conference of the Seventh-Day Adventist Church | Markham | $2.3M |
| Ontario Conference of the Seventh-Day Adventist Church | Mississauga | $2.2M |
| Ontario Conference of the Seventh-Day Adventist Church | Mississauga | $445K |
| Ontario Conference of the Seventh-Day Adventist Church | Mississauga | $216K |
| Ontario Conference of the Seventh-Day Adventist Church | Mississauga | $299K |
| Ontario Conference of the Seventh-Day Adventist Church | Mount Hope | $844K |
| Ontario Conference of the Seventh-Day Adventist Church | Nepean | $1.1M |
| Ontario Conference of the Seventh-Day Adventist Church | Niagara Falls | $389K |
| Ontario Conference of the Seventh-Day Adventist Church | North Bay | $95K |
| Ontario Conference of the Seventh-Day Adventist Church | North York | $2.9M |
| Ontario Conference of the Seventh-Day Adventist Church | North York | $161K |
| Ontario Conference of the Seventh-Day Adventist Church | North York | $351K |
| Ontario Conference of the Seventh-Day Adventist Church | North York | $559K |
| Ontario Conference of the Seventh-Day Adventist Church | North York | $438K |
| Ontario Conference of the Seventh-Day Adventist Church | Oakville | $616K |
| Ontario Conference of the Seventh-Day Adventist Church | Ohsweken | $42K |
| Ontario Conference of the Seventh-Day Adventist Church | Orangeville | $443K |
| Ontario Conference of the Seventh-Day Adventist Church | Orillia | $210K |
| Ontario Conference of the Seventh-Day Adventist Church | Orleans | $83K |
| Ontario Conference of the Seventh-Day Adventist Church | Orleans | $342K |
| Ontario Conference of the Seventh-day Adventist Church | Oshawa | $59.7M |
| Ontario Conference of the Seventh-Day Adventist Church | Oshawa | $112K |
| Ontario Conference of the Seventh-Day Adventist Church | Oshawa | $1M |
| Ontario Conference of the Seventh-Day Adventist Church | Oshawa | $2.5M |
| Ontario Conference of the Seventh-Day Adventist Church | Oshawa | $1.5M |
| Ontario Conference of the Seventh-Day Adventist Church | Ottawa | $832K |
| Ontario Conference of the Seventh-Day Adventist Church | Ottawa | $1.4M |
| Ontario Conference of the Seventh-Day Adventist Church | Ottawa | $708K |
| Ontario Conference of the Seventh-Day Adventist Church | Owen Sound | $162K |
| Ontario Conference of the Seventh-Day Adventist Church | Paris | $82K |
| Ontario Conference of the Seventh-Day Adventist Church | Parry Sound | $40K |
| Ontario Conference of the Seventh-Day Adventist Church | Pembrooke | $102K |
| Ontario Conference of the Seventh-Day Adventist Church | Perth | $122K |
| Ontario Conference of the Seventh-Day Adventist Church | Peterborough | $216K |
| Ontario Conference of the Seventh-Day Adventist Church | Pickering | $754K |
| Ontario Conference of the Seventh-Day Adventist Church | Richmond Hill | $414K |
| Ontario Conference of the Seventh-Day Adventist Church | Sarnia | $282K |
| Ontario Conference of the Seventh-Day Adventist Church | Sault Ste Marie | $293K |
| Ontario Conference of the Seventh-Day Adventist Church | Scarborough | $1.5M |
| Ontario Conference of the Seventh-Day Adventist Church | Scarborough | $477K |
| Ontario Conference of the Seventh-Day Adventist Church | Scarborough | $493K |
| Ontario Conference of the Seventh-Day Adventist Church | Scarborough | $253K |
| Ontario Conference of the Seventh-Day Adventist Church | Scarborough | $995K |
| Ontario Conference of the Seventh-Day Adventist Church | Scarborough | $246K |
| Ontario Conference of the Seventh-Day Adventist Church | Scarbrorough | $1.3M |
| Ontario Conference of the Seventh-Day Adventist Church | Simcoe | $245K |
| Ontario Conference of the Seventh-Day Adventist Church | Smiths Falls | $103K |
| Ontario Conference of the Seventh-Day Adventist Church | Smithville | $209K |
| Ontario Conference of the Seventh-Day Adventist Church | South River | $142K |
| Ontario Conference of the Seventh-Day Adventist Church | ST. Catherines | $559K |
| Ontario Conference of the Seventh-Day Adventist Church | ST Thomas | $408K |
| Ontario Conference of the Seventh-Day Adventist Church | Stoney Creek | $580K |
| Ontario Conference of the Seventh-Day Adventist Church | Sudbury | $250K |
| Ontario Conference of the Seventh-Day Adventist Church | Thunder Bay | $209K |
| Ontario Conference of the Seventh-Day Adventist Church | Timmins | $163K |
| Ontario Conference of the Seventh-Day Adventist Church | Toronto | $495K |
| Ontario Conference of the Seventh-Day Adventist Church | Toronto | $478K |
| Ontario Conference of the Seventh-Day Adventist Church | Toronto | $227K |
| Ontario Conference of the Seventh-Day Adventist Church | Toronto | $303K |
| Ontario Conference of the Seventh-Day Adventist Church | Toronto | $328K |
| Ontario Conference of the Seventh-Day Adventist Church | Toronto | $986K |
| Ontario Conference of the Seventh-Day Adventist Church | Toronto | $565K |
| Ontario Conference of the Seventh-Day Adventist Church | Vaughan | $407K |
| Ontario Conference of the Seventh-Day Adventist Church | Walford Station | $59K |
| Ontario Conference of the Seventh-Day Adventist Church | Whitby | $800K |
| Ontario Conference of the Seventh-Day Adventist Church | Willowdale | $1.1M |
| Ontario Conference of the Seventh-Day Adventist Church | Windsor | $902K |
| Ontario Conference of the Seventh-Day Adventist Church | Woodstock | $211K |
| Ontario Crafts Council | Toronto | $1.3M |
| Ontario Credit Union Foundation | Hamilton | $523K |
| Ontario Cross-Cultural Music Society | Markham | $37K |
| Ontario Cultural Society of the Deaf | Orillia | $11K |
| Ontario Deaf Foundation | Hamilton | $196K |
| Ontario Deaf Sports Association | Cobourg | — |
| Ontario Demolay Foundation | Nepean | — |
| Ontario Disability Employment Network | Whitby | $2.4M |
| Ontario District Association of Chapters of Spebsqsa | Tillsonburg | $194K |
| Ontario Early Years Centre | Midland | $871K |
| Ontario Early Years Centre Haliburton Victoria Brock Inc. | Lindsay | $1.2M |
| Ontario Eastern Bluebird Society | Whitby | $5,047 |
| Ontario Educational Leadership Centre- Centre d'Animation Scolaire de l'Ontario | London | $360K |
| Ontario Employment Education and Research Centre | Toronto | $2.5M |
| Ontario Family Caregivers' Advisory Network | Toronto | $2,010 |
| Ontario Farmland Trust | Guelph | $2.9M |
| Ontario Federation for Cerebral Palsy | Etobicoke | $1.4M |
| Ontario Federation of Anglers and Hunters Foundation | Peterborough | $7.2M |
| Ontario Federation of School Athletic Associations | Scarborough | $1.4M |
| Ontario Field Ornithologists | Springwater | $110K |
| Ontario Filipino Ministerial Fellowship (OFMF) | Scarborough | $15K |
| Ontario Foundation for Global Citizenship | York | $0 |
| Ontario Foundation for the Korean Blind | Richmond Hill | — |
| Ontario French-Language Educational Communi cations Authority | Toronto | $42M |
| Ontario Handweavers and Spinners | Lindsay | $59K |
| Ontario Headwaters Institute | Etobicoke | $22K |
| Ontario Heritage Fairs Association | Garson | $22K |
| Ontario High School German Contest | Toronto | $2,950 |
| Ontario Holstein Dairy Youth Trust Fund | Brantford | $246K |
| Ontario Home for Children and Youth | Brampton | $4,180 |
| Ontario Horticultural Association | Ottawa | $321K |
| Ontario Horticultural Trades Foundation | Milton | $524K |
| Ontario Hospice Foundation | Hamilton | $3,680 |
| Ontario Inter-Cultural Community Services | Brampton | $369K |
| Ontario Interdenominational Holiness Association | Napanee | — |
| Ontario Job Opportunity Information Network | Toronto | $0 |
| Ontario Justice Education Network / Reseau Ontarien d'Education Juridique | Toronto | $1.3M |
| Ontario Khalsa Darbar | Mississauga | $6.6M |
| Ontario Lacrosse Hall of Fame & Museum | Toronto | $29K |
| Ontario Land Trust Alliance Inc. | Toronto | $8.9M |
| Ontario Learning Development Foundation Inc. (o.l.d.f.) | North York | $315K |
| Ontario Learning Partnership Group/groupe de Partenariats d'Apprentissage de l'Ontario | Burlington | $94 |
| Ontario-Lesotho Educational Sustaining Fund | Toronto | $2,950 |
| Ontario Liberty Parish Celestial Church of Christ Canada | Toronto | $249K |
| Ontario Library Association | Toronto | $2.5M |
| Ontario Library Service | Sudbury | $8.2M |
| Ontario Lung Association | North York | $9.5M |
| Ontario Manitoba and Saskatchewan Swiss Communities Assistance Fund O.M.S.C.A.F. | Kanata | $893 |
| Ontario Medical Foundation | Toronto | $678K |
| Ontario Mennonite Relief Sale Inc. | New Hamburg | $587K |
| Ontario Model Forests | Kemptville | $124K |
| Ontario Municipal Management Institute | Oshawa | $97K |
| Ontario Museum Association | Toronto | $702K |
| Ontario Music Educators' Association | Pickering | $243K |
| Ontario Music Festivals Association Inc. Corporation l'Association des Festivals de Musique de l'Ontario | North York | $388K |
| Ontario Muslim Academy | Cambridge | $2.5M |
| Ontario Native Education Counselling Association | Naughton | $822K |
| Ontario Native Literacy Coalition | Ohsweken | $474K |
| Ontario Native Women's Charitable Foundation | Thunder Bay | $75K |
| Ontario Nature Inc. | Toronto | $4.9M |
| Ontario Neurotrauma Foundation | Toronto | — |
| Ontario Nursing Home Association Trust | Toronto | $7,329 |
| Ontario Odd Fellows and Rebekahs Humanitarian Service Committee | Stratford | $54K |
| Ontario Old Roman Catholic Church | Gilford | $1,864 |
| Ontario Organized Snowmobilers' Charitable Corporation | Barrie | $43K |
| Ontario P.i.r.g. | Guelph | $72K |
| Ontario Paraplegic Foundation | Toronto | $610K |
| Ontario Parents Advocating for Children With Cancer | Barrie | $256K |
| Ontario Parks Association | Cambridge | $573K |
| Ontario Philharmonic | Oshawa | $531K |
| Ontario Physical and Health Education Association | Toronto | $2.3M |
| Ontario Police Memorial Foundation | Scarborough | $91K |
| Ontario Pops Orchestra Inc. | Mississauga | $187K |
| Ontario Power Generation Employees' and Pensioners' Charity Trust Fund | Toronto | — |
| Ontario Prader-Willi Syndrome Association | Ajax | $132K |
| Ontario Professional Engineers Foundation for Education | North York | $394K |
| Ontario Provincial Federation of Chapters of the Council for Exceptional Children | Oakville | $94K |
| Ontario Provincial Police Youth Foundation | Orillia | $179K |
| Ontario Public Health Association l'Association pour la Sante Publique de l'Ontario | Sarnia | — |
| Ontario Puppetry Association | Mississauga | $11K |
| Ontario Quad Safety Council | Coe Hill | $47K |
| Ontario Realtors CARE Foundation | North York | $2.3M |
| Ontario Registered Music Teachers' Association Hamilton Branch Scholarship Fund | Burlington | $9,943 |
| Ontario Reptile Rescue | Caledon East | $26K |
| Ontario Rett Syndrome Association | Mississauga | $213K |
| Ontario Safety League | Mississauga | $2.5M |
| Ontario School of Ballet and Related Arts | Toronto | $2.1M |
| Ontario Search and Rescue Volunteer Association | Ilderton | $645K |
| Ontario Secondary Schools Spanish Contest | Toronto | — |
| Ontario Shores Centre for Mental Health Sciences | Whitby | $195.4M |
| Ontario Shores Foundation for Mental Health | Whitby | $3.7M |