| | Organization Name(s) | Located In |
| | H & R Block | Windsor |
 | H W Burgess Public School, LAMBTON KENT DISTRICT SCHOOL BOARD, Walllaceburg | Wallaceburg |
 | Habitat for Humanity Chatham-Kent | Chatham-Kent |
 | Habitat for Humanity Oxford Middlesex Elgin | London |
 | Habitat for Humanity Oxford Middlesex Elgin, Pacific Court ReStore | London |
 | Habitat for Humanity Sarnia/Lambton, Sarnia Chapter, ReStore | Sarnia |
 | Habitat for Humanity Windsor-Essex Inc, Windsor-Essex County | Windsor Central |
 | Habitat for Humanity Windsor-Essex Inc, Windsor-Essex County, Habitat ReSTORE | Windsor |
 | Haemophilia Society | Sarnia |
 | Hamilton Road Seniors Centre | London |
 | Hamilton Walk-in Clinic | London |
 | Handi-Transit | Windsor South |
 | Harmony In Action | Windsor Central |
 | Harrow Physiotherapy Centre | Harrow |
 | Harrow & Community Seniors Group | Harrow |
 | Harrow and Colchester South Minor Hockey Association | Harrow |
 | Harrow Baptist Church | Harrow |
 | Harrow Early Immigrant Research Society | Harrow |
| | Harrow Electric Eels Aquatics Team | Harrow |
 | Harrow Health Centre, A Family Health Team | Harrow |
 | Harrow Medical Clinic | Harrow |
 | Harrow News | Harrow |
 | Harrow South and Colchester South Community Centre | Harrow |
 | Harwich Raleigh Public School, LAMBTON KENT DISTRICT SCHOOL BOARD, Blenheim | Blenheim |
 | Hastings Manor Apartments of Parkhill | Parkhill |
 | Healing Connections Therapeutic Services, County Connections Wellness Centre | Lambton County |
 | Health Trust Medical Centre, After Hours Walk-In Clinic & Family Practice | Windsor Central |
 | Heart & Stroke Foundation, Sarnia - Lambton Area Office | Sarnia |
 | Heart and Stroke Foundation, Windsor Essex County Chapter | Windsor Central |
 | Heart and Stroke Foundation of Ontario, Chatham-Kent Chapter | Chatham |
 | Heart and Stroke Foundation of Ontario, Sarnia Chapter | Sarnia |
 | Heart and Stroke Foundation of Ontario - London Office | London |
 | Heart Defects Society of Windsor Essex County | Windsor East |
 | Heart of Essex - Sweet Adelines, Sweet Adelines | Essex (Town of) |
 | Hearts In Action First Aid | London |
| | Hearts Together For Haiti | Windsor |
 | Heavenly Rest Family of Catholic Cemeteries | Windsor South |
 | HELP Team/Mobile Crisis Team, Chatham-Kent Police Service | Chatham-Kent |
 | Helping Hand Food Bank | Tillsonburg |
 | Helping Hands Community Services, Chatham | Chatham |
 | Hemophilia Ontario - South Western Ontario Region | London |
 | Heritage Essex Inc | Essex (Town of) |
 | Heritage Park Alliance Church, Christian and Missionary Alliance Church | Windsor South |
 | Heritage Reformed Church Preschool | Burgessville |
 | Hey girl I need your dress Campaign, Salon Utopia Medspa, Free Prom Dress | Lakeshore |
 | Hiatus House | Windsor Central |
 | Hiatus House, County Program | Windsor Central |
 | Hiatus House, Family Court Support Worker Program | Windsor Central |
 | Hiatus House, Fresh Start Mens Groups | Windsor Central |
 | Hiatus House, Fresh Start Womens Groups | Windsor Central |
 | Hiatus House, Holiday Programs | Windsor Central |
 | Hiatus House, School Based Program | Windsor Central |
 | Hiawatha Benevolent Fund, Chapter 252 | Sarnia |
 | High Park United Church | Sarnia |
 | Highbury Medical Clinic | London |
 | Highgate and District Lions Club | Highgate |
 | Highview Residences - Dementia Care Inc | London |
 | Hindu Cultural Centre | London |
 | Hindu Temple and Cultural Center of Windsor | Windsor South |
 | Historic Downtown Chatham BIA | Chatham |
 | Historical Society of Blenheim and District | Blenheim |
 | HIV Care Program, Tecumseh-Byng Clinic | Windsor Central |
 | HIV Care Program, Tecumseh-Byng Clinic, Anonymous Testing Program | Windsor Central |
| | Hogan Pharmacy, Bayside Mall Sarnia | Sarnia |
| | Hogan Pharmacy, Corunna Medical Clinic | Corunna |
| | Hogan Pharmacy, Holistic Medicine and Counselling | Sarnia |
 | Hogan Pharmacy Long Term Care Division | Sarnia |
| | Holiday Sharing Guide, Windsor and Essex County | Windsor Central |
 | Holy Cross Greek Orthodox Church | Windsor Central |
 | Holy Family Church | Wallaceburg |
 | Holy Family Retreat House | Harrow |
 | Holy Family School, St Clair Catholic District School Board, Wallaceburg | Wallaceburg |
 | Holy Name of Jesus Catholic Church | Essex (Town of) |
 | Holy Redeemer Parish Cluster, Wallaceburg/Port Lambton, Holy Redeemer Parish Cluster Sacred Heart-Holy Family-Our Lady of Help Christians | Wallaceburg |
| | Holy Rosary Catholic School | Plympton-Wyoming |
 | Holy Trinity Anglican Church | Chatham |
 | Holy Trinity Greek Orthodox Community - Hellenic Community Centre | London |
 | Holy Trinity Roman Catholic Church | Windsor Central |
 | Holy Trinity Ukrainian Orthodox Church | Sarnia |
| | Home Childcare Providers' Network | Windsor |
| | Home Instead Senior Care | Sarnia |
 | Home Instead Senior Care, Windsor Essex County | Tecumseh |
 | Home Instead Senior Care - London-St Thomas-Sarnia | London |
| | Home Maintenance - London and Middlesex | London |
 | Home Trader, Southwestern Ontario | London |
 | Homeless Coalition of Windsor-Essex County | Windsor Central |
| | Homemaking Services - London and Middlesex | London |
 | Homeopathic Wellness Clinic | Woodstock |
| | Homeopathy for Life | Sarnia |
 | Homestead Christian Care | Woodstock |
 | Hope and Healing Associates | Blenheim |
 | Hope Counselling Centre | London |
 | Hope Housing, In Home Support Program, Chatham-Kent Children's Services | Chatham |
 | Hope United Church, Brooke Township | Alvinston |
 | Hope's Garden, Eating Disorders Support and Resource Centre | London |
 | Horizon Place Retirement Residence | London |
 | Hoskins Housing Co-Operative | Sarnia |
 | Hospice of Windsor and Essex County Inc (The) | Windsor East |
 | Hospice of Windsor and Essex County Inc (The), Wellness Centre | Windsor East |
 | Hospitable Toastmasters Club | Sarnia |
 | Hot Meals, Soup Kitchens and Congregate Dining, Chatham-Kent, Campbell AME | Chatham |
| | Hot Meals, Soup Kitchens and Congregate Dining, Chatham-Kent, Christ Church | Chatham |
| | Hot Meals, Soup Kitchens and Congregate Dining, Chatham-Kent, Erie St United Church | Ridgetown |
 | Hot Meals, Soup Kitchens and Congregate Dining, Chatham-Kent, First Baptist Church, Wallaceburg | Wallaceburg |
 | Hot Meals, Soup Kitchens and Congregate Dining, Chatham-Kent, First Presbyterian Church | Chatham |
| | Hot Meals, Soup Kitchens and Congregate Dining, Chatham-Kent, Interfaith Caring Kitchen, St Ursula Parish Hall | Chatham |
 | Hot Meals, Soup Kitchens and Congregate Dining, Chatham-Kent, Praise Fellowship Church | Chatham |
| | Hot Meals, Soup Kitchens and Congregate Dining, Chatham-Kent, St Agnes Church | Chatham |
 | Hot Meals, Soup Kitchens and Congregate Dining, Chatham-Kent, St James the Apostle Anglican Church, Wallaceburg | Wallaceburg |
 | Hot Meals, Soup Kitchens and Congregate Dining, Chatham-Kent, St Joseph Parish Hall | Chatham |
 | Hot Meals, Soup Kitchens and Congregate Dining, Chatham-Kent, Trinity United Church, Wallaceburg | Wallaceburg |
 | Hot Meals, Soup Kitchens and Congregate Dining, Chatham-Kent, Victoria Avenue United Church | Chatham |
 | Hot Meals, Soup Kitchens and Congregate Dining, Chatham-Kent, Word of LIfe Church, Blenheim | Blenheim |
 | Hotel-Dieu Grace Hospital | Windsor Central |
 | Hotel-Dieu Grace Hospital, Adult Mental Health Services | Windsor Central |
 | Hotel-Dieu Grace Hospital, Ambulatory Care Clinics | Windsor Central |
 | Hotel-Dieu Grace Hospital, Lupus and Rheumatic Disease Clinic | Windsor Central |
 | Hotel-Dieu Grace Hospital, Satellite Renal Clinic | Windsor Central |
 | House of Shalom Youth Centre | Amherstburg (Town of) |
 | House of Sophrosyne | Windsor West |
 | House of Sophrosyne, Concurrent Supportive Housing Community Program | Windsor West |
 | House of Sophrosyne, HEROS program | Windsor West |
 | Housing Information Services of Windsor and Essex County | Windsor East |
 | Housing Information Services of Windsor and Essex County, LEAP Emergency Financial Assistance | Windsor East |
 | Housing Support Services Program, Salvation Army Family and Community Services, Chatham | Chatham |
 | Howard Avenue Walk-in Clinic | Windsor East |
 | Howard Trinity Church, Ridgetown, Chapel of Ease - no regular church services | Ridgetown |
 | Hudson Manor Retirement Residence, Tilbury | Tilbury |
 | Huff n' Puff Seniors Fitness Association | London |
 | Human Resources and Skills Development Canada, Income Security Programs, Chatham | Chatham |
| | Human Resources Professionals Association of Kent | Chatham-Kent |
 | Humble Beginnings Nursery School | London |
| | Hunger Relief Action Coalition | London |
 | Huntington Society of Canada, Chatham-Kent | Chatham |
| | Huntington Society of Canada - London and Area Chapter | London |
 | Huron Baptist Church | Sarnia |
| | Huron Country Playhouse & Playhouse II | Grand Bend |
 | Huron Hospice Volunteer Service, Bereavement Services | Seaforth |
 | Huron House Boys' Home | Bright's Grove |
 | Huron Lodge Municipal Long Term Care | Windsor West |
 | Huron Medical Centre | London |
| | Huron Oaks Recreation Centre | Lambton County |
 | Huron Recreation Riders, Canadian Vintage Motorcycle | Sarnia |
 | Huron Shores Optimist Club | Camlachie |
 | Huron Web | Wyoming |
| | Huronia Hearing - A Division of Sound Therapy | Grand Bend |
| | Huronia Hearing - A Division of Sound Therapy | Grand Bend |
| | Huronview Apartments, County of Lambton. Housing Services Department. Point Edward | Point Edward |
 | Hutton House - Association for Adults with Disabilities | London |
 | Hutton House - Association for Adults with Disabilities, Artworks | London |
 | Hutton House - Association for Adults with Disabilities, Day Break | London |
 | Hutton House - Association for Adults with Disabilities, Learning Centre (Employment, Voluntarism and Education Programs) | London |
 | Hutton House - Association for Adults with Disabilities, Learning Centre (Employment, Voluntarism and Education Programs), Access Voluntarism | London |
 | Hutton House - Association for Adults with Disabilities, Learning Centre (Employment, Voluntarism and Education Programs), Adult Education | London |
 | Hutton House - Association for Adults with Disabilities, Learning Centre (Employment, Voluntarism and Education Programs), Ontario Employment Assistance Services OEAS | London |
 | Hutton House - Association for Adults with Disabilities, LifeWorks | London |
 | Hutton House - Association for Adults with Disabilities, Pottery Studio | London |
 | Hyde Park Medical and Walk-In Clinic | London |