| Historic Gayety Theatre (The) | Collingwood |
| Habitat for Humanity, Orillia | Orillia |
| Habitat for Humanity, Orillia, ReStore | Orillia |
| Habitat for Humanity Huronia | Barrie |
| Habitat for Humanity Huronia, Alliston, ReStore, Alliston | New Tecumseth |
| Habitat for Humanity Huronia, Barrie | Barrie |
| Habitat for Humanity Huronia, Barrie, ReStore, Barrie | Barrie |
| Habitat for Humanity Ontario Gateway North | Midland |
| Habitat for Humanity Ontario Gateway North, Midland ReStore, Simcoe North | Midland |
| Habitat for Humanity Ontario Gateway North, Simcoe North, North Simcoe Chapter | Midland |
| Habitat for Humanity South Georgian Bay | Collingwood |
| Habitat for Humanity South Georgian Bay | Collingwood |
| Habitat for Humanity South Georgian Bay, ReStore | Collingwood |
| Hair Prosthesis Centre | Barrie |
| HammondBus.com, Oro-Medonte, Hammond Transportation, Oro-Medonte | Hawkestone |
| Hank the Home Specialist | Clearview (Simcoe County) |
| Happy at Home Support Services Inc, Orillia, Happy at Home Support Services | Orillia |
| Happy at Home Support Services Inc, Transportation, Orillia, Orillia | Orillia |
| Happy Tails Pet Resort and Camp, Long Term Pet Care | Huntsville |
| Harbour Dental Hygiene Clinic | Collingwood |
| Harbour View Denture Clinic | Midland |
| Harvest Bible Chapel, Barrie | Barrie |
| Haven of The Heart | Adjala-Tosorontio |
| Hawkestone Singers, Mailing Address | Hawkestone |
| Head Lice Hunters, Mobile Service | Innisfil |
| Healthy Babies Healthy Families, Collingwood | Collingwood |
| Healthy Community Network Wasaga Beach | Wasaga Beach |
| HearCANADA, Orillia | Orillia |
| Hearing Life, Collingwood Hearing Clinic | Collingwood |
| Hearing Life, Wasaga Beach | Wasaga Beach |
| Hearing Life Canada, Hearing Sciences Audiology and Hearing Aid Centre | Collingwood |
| Hearing Rehab Centre (The) | Midland |
| HearingLife, Collingwood | Collingwood |
| Heart and Stroke, Mailing Address | Toronto |
| Heart to Home Meals | Collingwood |
| Heartfelt Home Care, Midland, Home Support Services | Midland |
| HeartFlame, Individual and Couples Therapy | Collingwood |
| Heather Leclerc, Bracebridge, Blue Sky's Academic Based Child Care | Bracebridge |
| Help Call, Personal Emergency Response Services | Orangeville |
| HELP First Aid, Collingwood | Collingwood |
| Help is Here, Collingwood - Mailing Address | Collingwood |
| Helping Buddy Muskoka | Huntsville |
| Helping Hand Food Bank | Bradford West Gwillimbury |
| Helping Hand New To You | Essa |
| Helping Hands, Assisted Living Services, Orillia | Orillia |
| Helping Hands, Homemaking Services, Orillia | Orillia |
| Helping Hands, Meals on Wheels, Orillia | Orillia |
| Helping Hands, Orillia, Personal Care and Caregiver Relief | Orillia |
| Helping Hands, Telephone Reassurance, Orillia | Orillia |
| Helping Hands, Transitional Bed Program, Orillia | Orillia |
| Helping Hands, Transportation, Orillia | Orillia |
| Helping Hands for the Homeless | Barrie |
| Helping Hands Home Health Care, Collingwood - Mailing Address | Collingwood |
| Hemophilia Ontario | Scarborough North |
| Henninger Speech and Language Centre | Barrie |
| Heritage Baptist Church, Barrie | Barrie |
| Heritage Barrie, Barrie | Barrie |
| Heritage Christian Academy | Barrie |
| Highlands Trailblazers Ski Club, Highlands Nordic Ski Area | |
| Hikewood Therapy Services | Springwater |
| Hillcrest Lodge Senior Bachelor Apartments | Orillia |
| Hillcrest Village Care Centre | Midland |
| Hillside Bible Chapel, Youth, women's and men's groups | Orillia |
| Hillside Community Church | New Tecumseth |
| Hi-Mark Occupational Skills Training Centre | Oro-Medonte |
| Historic Military Establishment of Upper Canada / Royal Newfoundland Regiment | Penetanguishene |
| Historical Automobile Society of Canada (HASC), Orillia - Mailing Address, Huronia Region | Orillia |
| HIV & AIDS Legal Clinic Ontario (HALCO) | Toronto |
| Hiway Pentecostal Church, Barrie | Barrie |
| Holly Physiotherapy and Rehabilitation, Barrie | Barrie |
| Holt, Tamara | Collingwood |
| Holy Cross - St Nektarios Greek Orthodox Community | Barrie |
| Holy Martyrs of Japan Roman Catholic Church | Bradford West Gwillimbury |
| Holy Martyrs of Japan Roman Catholic Church, St. Vincent de Paul | Bradford West Gwillimbury |
| Holy Spirit Parish, Barrie | Barrie |
| Home Care Assistance | Barrie |
| Home Comfort Care Services, Gravenhurst, Home Comfort Care Services, Gravenhurst | Gravenhurst |
| Home Comfort Care Services, Huntsville, Home Comfort Care Services, Huntsville | Huntsville |
| Home Horizon, Collingwood, Barbara Weider House | Collingwood |
| Home Instead, Barrie | Barrie |
| Homebuttons Electronic Systems, Mobile Service | Meaford |
| Hope Barrie | Barrie |
| Hope Barrie, Higher Grounds Coffee House | Barrie |
| Hope Barrie, Barrie - Mary St, Hope Centre | Barrie |
| Hope Chapel | Collingwood |
| Hope Community Christian Church | Severn |
| Hope Haven Therapeutic Riding Centre | Grey Highlands |
| Hope+Me - Mood Disorders Association of Ontario, Mood Disorders Association of Ontario | Toronto Downtown |
| Hopewood Clinic, Angus, Angus Rapid Access Addiction Medicine (RAAM) Clinic | Essa |
| Hopewood Clinic, Wasaga Beach, Wasaga Beach Rapid Access Addiction Medicine (RAAM) Clinic | Wasaga Beach |
| Hospice Georgian Triangle | Collingwood |
| Hospice Huronia, Fuller Ave, Tomkins House | Penetanguishene |
| Hospice Orillia | Orillia |
| Hospice Orillia, Overdose Related Loss Support Group | Orillia |
| Hospice Simcoe | Barrie |
| Hospice Simcoe, Bell Farm Rd, Grief and Bereavement Support | Barrie |
| Hospice Simcoe, Bell Farm Rd, Visiting Hospice/Community Programs | Barrie |
| Hospice Simcoe, Penetanguishene Rd | Barrie |
| Hospice Simcoe, Penetanguishene Rd, Residential Hospice | Barrie |
| Hospital for Sick Children, Adolescent Medicine | Toronto |
| Human Resources Professionals Association, Barrie and District Chapter | Barrie |
| Human Rights Tribunal of Ontario | Toronto |
| Hummingbird Montessori School | Clearview (Simcoe County) |
| Huronia Airport | Tiny |
| Huronia Alarm and Fire Security, Collingwood Office, Huronia Alarm and Fire Security, Collingwood Office | Collingwood |
| Huronia Alarm and Fire Security, Midland Office, Huronia Alarm and Fire Security, Midland Office | Midland |
| Huronia Animal Control, Huronia Animal Control - Penetang | Tiny |
| Huronia Community Foundation | Midland |
| Huronia Family Housing Co-Operative | Midland |
| Huronia Fur and Feather Breeders Association | Oro-Medonte |
| Huronia Handgun Club | Penetanguishene |
| Huronia Handweavers | Springwater |
| Huronia Harmonizers | Midland |
| Huronia Historical Parks, Sainte-Marie Among The Hurons | Midland |
| Huronia Land Conservancy | Midland |
| Huronia Museum and Huron-Ouendat Village, Day Camp and Holiday Programs | Midland |
| Huronia Museum and Huron-Ouendat Village | Midland |
| Huronia Museum and Huron-Ouendat Village, No Physical Address, Film Series | |
| Huronia Nurse Practitioner-Led Clinic | Oro-Medonte |
| Huronia Physiotherapy and Chiropractic Clinic, Midland - Jones Rd, Midland | Midland, Penetanguishene & Area |
| Huronia Players, Huronia Players - MCC | Midland |
| Huronia Radio Control Club | Barrie |
| Huronia Rose Society | Barrie |
| Huronia Seniors Volunteer Care Team, Midland, Wheels 4 Wheels | Midland |
| Huronia Soccer Club | Midland |
| Huronia Spinners Guild | Minesing |
| Huronia Stallions Football Club, Mailing Address | Springwater |
| Huronia Symphony Orchestra | Barrie |
| Huronia Transition Homes | Midland |
| Huronia Transition Homes, Athena's Sexual Assault Counselling & Advocacy Centre | Barrie |
| Huronia Transition Homes, Choices for Children | Midland |
| Huronia Transition Homes, La Maison Rosewood Shelter | Midland |
| Huronia Transition Homes, Operation Grow | Midland |
| Huronia Travel Clinic | Barrie |
| Huronia Urgent Care Clinic | Barrie |
| Hurons Gymnastic Club | Midland |
| Hurons Gymnastic Club, Day Camp Programs | Midland |
| Hydro One | Toronto |
| Hydrocephalus Canada | Etobicoke Central |