| | Organization Name(s) | Located In |
 | Habitat for Humanity | Toronto |
| Habitat for Humanity York Region | Newmarket |
| Habitat for Humanity York Region, ReStore | Newmarket |
| Hagerman Corners Community Homes | Markham |
| Hagerman Mennonite Church | Markham |
| Haldimand-Norfolk Information Centre | Simcoe |
| Hampton Green Condominiums | Markham |
| Harbourfront | Toronto |
| Harding Medical & After Hours Clinic, Walk-In Clinic | Richmond Hill |
| Hartman YMCA Child Care | Aurora |
| Harvest Bible Chapel | Markham |
| Harvest Ontario, Pick Your Own | Toronto |
| Hayyan Healthcare | Richmond Hill |
| Health Canada, Centre for Emergency Preparedness and Response (CEPR), Ontario | Ottawa |
| Health Centre of Maple (The) | Maple |
| | Healthy Canadians | Canada |
| Heart and Stroke Foundation of Ontario, York Region North | Newmarket |
| Heart and Stroke Foundation of Ontario, York Region South | Richmond Hill |
| | Heep Chi Association | Richmond Hill |
| Heintzman House | Thornhill |
| Helpful Care In-Home Services | York Region |
| Helping Homeless Pets | York Region |
| Hemophilia Society, Toronto and Central Ontario Region | Toronto |
| Henri Nouwen Society | Toronto |
| Hepatitis C Society of Canada, York Region Chapter | Unionville |
| Heritage Canada Foundation | Ottawa |
| Heritage East Gwillimbury Advisory Committee | Sharon |
| Heritage Markham | Markham |
| Heritage Richmond Hill | Richmond Hill |
| Heritage Schoolhouse | Markham |
| Heritage United Church | Markham |
| Heritage Vaughan | Vaughan |
| Herongate Barn Dinner Theatre | Pickering |
| Hesperus Fellowship Community, Hesperus Village | Thornhill |
| | Hike Ontario | King City |
| Hill House Hospice | Richmond Hill |
| Hillary House, The Koffler Museum of Medicine | Aurora |
| Hillcrest Mall | Richmond Hill |
| Hillstreams Christian Fellowship Markham-Richmond Hill | Markham |
| Hilltop Toastmasters | Richmond Hill |
| Historic Cemeteries of South York Region | Richmond Hill |
| Historic Fort York | Toronto |
| Hockey Hall of Fame | Toronto |
| | Hockley Valley Tree Farm Inc. | Orangeville |
| HOLIDAY BAZAAR & FESTIVE CAFE (Christmas Sale), MAY SALE & BAR B Q | Unionville |
| Holland Marsh Christian Reformed Church | Newmarket |
| Holland Marsh District Christian School | King Township |
| | Holland Marsh Growers' Association | Newmarket |
| Holland Orthopaedic & Arthritic Centre, of Sunnybrook Health Sciences Centre | Toronto |
| Hollandview Trail Retirement Community | Aurora |
| Hollidge Medical Centre | Aurora |
| Holy Cross Cemetery | Thornhill |
| Holy Family Daycare Centre, Operated by the Carmelite Missionary Sisters of St. Theresa of the child of Jesus | Woodbridge |
| Holy Trinity Anglican Church | Thornhill |
| Holy Trinity School | Richmond Hill |
| Home Relief Health Services | Markham |
| Home Service Club | Toronto |
| | Homes for the Holidays | Markham |
| Hope Air | Toronto |
| Horses At Heart Equestrian Adventures Inc., Horses | Newmarket |
| | Horses of Course | York Region |
| Horton Tree Farms | Stouffville |
| Hortons Tree Farms | Stouffville |
| Hospice Georgina | Sutton |
| Hospice King Aurora | Aurora |
| Hospice Richmond Hill | Richmond Hill |
| Hospice Thornhill | Thornhill |
| Hospice Vaughan | Woodbridge |
| Hospital for Sick Children (The) | Toronto |
| | House Calls Services, Home Visits by Doctor | Toronto |
| Housing Help Centre | Richmond Hill |
| | Human Resource Professionals of York Region | Aurora |
| | Human Resources and Skills Development Canada (HRSDC), Skills and Employment Branch, Job Bank | Richmond Hill |
| Humanity First | Concord |
| Humanity First | Concord |
| Humber College, North Campus | Toronto |
| Humber River Regional Hospital, Church Street Site | Toronto |
| Humber River Regional Hospital, Finch Avenue Site | Toronto |
| Humber River Regional Hospital, Keele Street Site | Toronto |
| | Humber Valley Heritage Trail Association | Bolton |
| Humber Watershed Alliance | Toronto |
| Humewood House Association | Toronto |
| Hydro One Networks Inc | Markham |
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