| | Organization Name(s) | Located In |
| | War Amputations of Canada (The), Customer Service | Scarborough |
 | War Amputations of Canada (The), National Headquarters | Ottawa |
 | Warden Park Senior Citizens Club | Stoney Creek |
 | Warm Up Canada | Caledonia |
 | Wat Khmer Kampuchea Krom Buddhist, Temple and Mediation Centre, Stoney Creek | Stoney Creek |
| | Waterdown Business Improvement Area | Waterdown |
 | Waterdown District Children's Centre | Waterdown |
 | Waterdown District Children's Centre, Waterdown District School Age Program, Guy Brown Location | Waterdown |
 | Waterdown District Children's Centre, Waterdown District School Age Program, Mary Hopkins Location | Waterdown |
 | Waterdown Legion Hall | Waterdown |
 | Waterdown Minor Baseball Association | Waterdown |
 | Waterdown North Wetland Trails & Joe Sams Flamborough Leisure Park | Flamborough |
 | Waterdown Parents for French Immersion | Waterdown |
| | Waterdown Rod and Gun Club | Flamborough |
 | Waterdown Seniors Club 280 | Waterdown |
 | Waterdown Village Squares | Waterdown |
| | Wave 94.7 Radio Station | Hamilton Mountain East |
 | Wayside House of Hamilton | Hamilton West |
 | We Care Home Health Services | Hamilton East |
| | Wee Watch Enriched Home Child Care, Burlington / Waterdown | Waterdown |
| | Wee Watch Enriched Home Child Care, Hamilton | Hamilton (City of) |
| | Wee Watch Enriched Home Child Care, Stoney Creek | Hamilton (City of) |
 | Weehands Baby Sign Language Programs | Hamilton Mountain West |
 | Welcome Inn Community Centre | Hamilton Central |
 | Welcome Inn Community Centre, Mennonite Church | Hamilton Central |
 | Welcome Inn Community Centre, New Horizons Thrift Store | Hamilton Central |
 | Welcome Inn Community Centre, Out of School Programs | Hamilton Central |
 | Welcome Inn Community Centre, Seniors Support Program | Hamilton Central |
| | Welcome Wagon, Ancaster | Ancaster |
| | Welcome Wagon, Binbrook | Glanbrook |
| | Welcome Wagon, Dundas | Dundas |
| | Welcome Wagon, Flamborough | Waterdown |
| | Welcome Wagon, Stoney Creek | Hamilton (City of) |
 | Wellington Nursing Home (The) | Hamilton Mountain West |
 | Wellington Psychiatric Outreach Program | Hamilton Central |
 | Wellington Psychiatric Outreach Program, Arts and Crafts | Hamilton Central |
 | Wellington Psychiatric Outreach Program, Healthy Lifestyles Change Group | Hamilton Central |
 | Wellington Psychiatric Outreach Program, Leisure Time | Hamilton Central |
 | Wellington Psychiatric Outreach Program, Life Skills and Basic Cooking Skills | Hamilton Central |
 | Wellington Psychiatric Outreach Program, Light Physical Activity Group | Hamilton Central |
 | Wellington Psychiatric Outreach Program, Social Skills | Hamilton Central |
 | Wellwood Resource Centre of Hamilton | Hamilton Mountain East |
 | Wellwood Resource Centre of Hamilton, Breast Cancer Peer Support Group | Hamilton Mountain East |
 | Wellwood Resource Centre of Hamilton, Caregiver Support | Hamilton Mountain East |
 | Wellwood Resource Centre of Hamilton, Living Well With Cancer Peer Support Group | Hamilton Mountain East |
 | Wellwood Resource Centre of Hamilton, Support For Women With Gynecological Cancer | Hamilton Mountain East |
 | Wentworth Arenas, Indoor Facilities | Hamilton West |
 | Wentworth Baptist Church | Hamilton East |
 | Wentworth Baptist Church, Agape Community Resource Centre | Hamilton East |
 | Wentworth Baptist Church, Agape Community Resource Centre, Emergency Food Assistance | Hamilton East |
 | Wentworth Skating Club | Hamilton Mountain West |
 | Wesley Urban Ministries Incorporated | Hamilton Central |
 | Wesley Urban Ministries Incorporated, Child, Youth and Family Programs, After School Program | Hamilton East |
 | Wesley Urban Ministries Incorporated, Child, Youth and Family Programs, Teen Drop in Centre | Hamilton West |
 | Wesley Urban Ministries Incorporated, Community Access To Child Health | Hamilton East |
 | Wesley Urban Ministries Incorporated, Employment, Education, Health and Housing, Case Management and Support Team | Hamilton Central |
 | Wesley Urban Ministries Incorporated, Employment, Education, Health and Housing, Employment and Education Resource Centre | Hamilton Central |
 | Wesley Urban Ministries Incorporated, Employment, Education, Health and Housing, Multi-Cultural Seniors Outreach Program | Hamilton Central |
 | Wesley Urban Ministries Incorporated, Family Home Visitor Program, Healthy Babies Healthy Children | Hamilton West |
 | Wesley Urban Ministries Incorporated, Shelter, Homelessness and Emergency Services, Christmas Assistance - Food - Gifts - Toys - Registration | Hamilton Central |
 | Wesley Urban Ministries Incorporated, Shelter, Homelessness and Emergency Services, Christmas Store | Hamilton West |
 | Wesley Urban Ministries Incorporated, Shelter, Homelessness and Emergency Services, Claremont House Special Care Unit | Hamilton Mountain West |
 | Wesley Urban Ministries Incorporated, Shelter, Homelessness and Emergency Services, Wesley Centre | Hamilton Central |
 | Wesley Urban Ministries Incorporated, Shelter, Homelessness and Emergency Services, Wesley Youth Housing Program | Hamilton Central |
 | Wesley Urban Ministries Incorporated, Wesley Child Care Centre | Hamilton West |
 | Wesley Urban Ministries Incorporated, Wesley Neighbourhood Centre | Hamilton East |
 | Wesley Urban Ministries Incorporated, Wesley Urban Ministries' School Age Program | Hamilton West |
 | West Avenue Christian Church | Hamilton East |
 | West Flamboro Presbyterian Church | Flamborough |
| | West Hamilton Network | Hamilton West |
 | West Hamilton WrapAround | Hamilton West |
| | West Hamilton Youth Soccer Club | Hamilton West |
 | West Highland Baptist Church | Hamilton Mountain West |
 | West Highland Baptist Church, Hamilton Community Gardens | Hamilton Mountain West |
 | West Mountain Footcare Clinic | Hamilton Mountain West |
 | West Mountain Montessori School | Hamilton Mountain Central |
| | West Mountain Neighbourhood Network | Hamilton (City of) |
 | Westdale Children's School | Hamilton West |
 | Westdale Co-operative Preschool Inc | Hamilton West |
 | Westdale Reformed Church | Hamilton West |
 | Westdale United Church | Hamilton West |
 | Westdale Village Business Improvement Area | Hamilton West |
| | Western Union | Hamilton (City of) |
 | Westfield Heritage Village, Ironwood Teahouse (The), Hamilton Conservation Authority | Rockton |
 | Westmount Children's Centre Inc | Hamilton Mountain Central |
 | Westmount Community Health Centre, Geriatric Assessment Outpatient Clinic | Hamilton Mountain West |
| | Westover Artist Club | Flamborough |
 | Westover Baptist Church, A 2 Point Parish With Mountsberg Baptist | Westover |
 | Westside Baptist Church | Hamilton West |
 | Westside Concert Theatre | Hamilton Central |
 | Widows Support Group, Friendship Group | Ancaster |
| | Williams Brothers Strawberries | Millgrove |
 | Willow Stream Counselling | Hamilton East |
 | Willowgrove Long Term Care Centre (The) | Ancaster |
 | Wilson Medical Centre | Hamilton Central |
 | Winona Children's Centre | Winona |
 | Winona Gospel Church | Stoney Creek |
 | Winona Gospel Church, Kidquest Camp, Day Camp Programs | Stoney Creek - Lower |
 | Winona Horticultural Society | Winona |
| | Winona Mens Club | Stoney Creek |
 | Winona Peach Festival | Winona |
| | Woman Abuse Working Group | Hamilton (City of) |
 | Womankind Addiction Service | Hamilton West |
 | Womankind Addiction Service, Taking Steps | Hamilton West |
| | Women of the Moose Lodge, Chapter 753 | Hamilton East |
| | Women Who Excel | Hamilton (City of) |
 | Women's Canadian Club of Hamilton, Hamilton Branch | Hamilton Central |
 | Women's Legal Education and Action Fund | Toronto |
 | Womens Community Cooperative Incorporated | Hamilton East |
 | Womens Institute Hall, Wentworth North, Troy Branch | Troy |
 | Woodvale Community Church | Hamilton West |
| | Woodview Children's Mental Health and Autism Services, Hamilton Programs, Administration Office | Burlington |
 | Woodview Children's Mental Health and Autism Services, Hamilton Programs, Hamilton Day Treatment, Adolescent Day Treatment, Delta Secondary School Location | Hamilton East |
 | Woodview Children's Mental Health and Autism Services, Hamilton Programs, Hamilton Day Treatment, Adolescent Day Treatment, Mountain Secondary School Location | Hamilton Mountain Central |
 | Woodview Children's Mental Health and Autism Services, Hamilton Programs, Woodview Manor | Hamilton Mountain East |
 | Woodview Children's Mental Health and Autism Services, Hamilton Programs, Woodview Manor, Non Residential Programs, Children and Teen Groups | Hamilton Mountain East |
 | Woodview Children's Mental Health and Autism Services, Hamilton Programs, Woodview Manor, Non Residential Programs, Transitional Age Group | Hamilton Mountain East |
 | Woodview Children's Mental Health and Autism Services, Hamilton Programs, Woodview Manor, Residential Programs, Manor Supported Independent Living | Hamilton Mountain East |
 | Woodview Children's Mental Health and Autism Services, Hamilton Programs, Woodview Manor, Residential Programs, Manor Teaching Unit | Hamilton Mountain East |
 | Workers Arts and Heritage Centre | Hamilton Central |
| | Workers Arts and Heritage Centre, Sabawoon Outdoor Art Market | Hamilton Central |
 | Workplace Safety and Insurance Board, Hamilton District Office | Hamilton Central |
 | World Class Gymnastics, Day Camp Programs | Hamilton West |
 | World Vision Canada | Mississauga |
 | World Wildlife Fund Canada | Toronto |
 | Worship With Us Ministries | Hamilton Central |
| | Wraparound, Golden Horseshoe Wraparound, Dundas Area | Dundas |
| | Wraparound, Golden Horseshoe Wraparound, Hamilton Downtown Area | Hamilton Central |
| | Wraparound, Golden Horseshoe Wraparound, Hamilton East Area | Stoney Creek - Lower |
| | Wraparound, Golden Horseshoe Wraparound, Hamilton Mountain Area | Hamilton Mountain |
 | Wraparound, Golden Horseshoe Wraparound, Stoney Creek Area | Stoney Creek - Lower |