| W. Ross Macdonald School for the Blind | Brantford |
| Wai Nui O Kanaka Outrigger Canoe Club | Oakville |
| Walden International School, Private Elementary School | Oakville |
| Walk with a Doc, Mississauga and Oakville (Chapter 14176) | Mississauga |
| Walker Industries, Walker Waste Services | Burlington |
| Walkers Medical Centre, Walk-in Medical Clinic | Burlington |
| Walkers Medical Pharmacy, Pharmacy Services | Burlington |
| Walk-In Medical Clinics, Burlington | Burlington |
| Walk-In Medical Clinics, Halton Hills | Halton Hills |
| Walk-In Medical Clinics, Milton | Milton |
| Walk-In Medical Clinics, Oakville | Oakville |
| Wallace Park Tennis Club | Oakville |
| Walmart Pharmacy, Burlington - Dundas St W, Pharmacy Services | Burlington |
| Walmart Pharmacy, Burlington - Fairview St, Pharmacy Services | Burlington |
| Walmart Pharmacy, Georgetown - Guelph St, Pharmacy Services | Halton Hills |
| Walmart Pharmacy, Milton - Steeles Ave E, Pharmacy Services | Milton |
| Walmart Pharmacy, Oakville - Hays Blvd, Pharmacy Services | Oakville |
| Walton Memorial United Church | Oakville |
| War Amps (The), National Headquarters | Ottawa |
| Wastewise, Georgetown, Thrift Store | Georgetown |
| Waterdown Manor | Hamilton |
| Waterdown Montessori School, Licensed Child Care Centre | Burlington |
| Waterdown Rod and Gun Club, Waterdown Rod and Gun Club Programs | Hamilton |
| We Love Oakville | Oakville |
| We Matter, Indigenous Youth Support | British Columbia |
| We Rock the Spectrum Kid's Gym | Oakville |
| Web Networks | Toronto |
| Wee Care Educational Services, Burlington - Plains Rd, Licensed Child Care Centre | Burlington |
| Wee Care Educational Services, Burlington - Downsview Dr, Licensed Child Care Centre | Burlington |
| Wee Ones Childcare Academy, Licensed Child Care Centre | Milton |
| Wee Watch Burlington Licensed Home Child Care Agency, Licensed Home Child Care | Burlington |
| Wee Watch Milton and Halton Hills Licensed Home Child Care Agency, Licensed Home Child Care | Milton |
| Wee Watch Oakville Licensed Home Child Care Agency, Licensed Home Child Care | Oakville |
| Welcome Home Transitions, Senior Living Advisor | Oakville |
| WELL Health Diagnostic Centres, Cardiology and Diagnostic Imaging | Milton |
| WELL Health Medical Centre, Walk-in Medical Clinic | Oakville |
| Wellbeings Pain Management and Dependency Clinic | Burlington |
| Wellbrook Place East | Erin Mills |
| Wellbrook Place West | Mississauga |
| Wellington County Library, Rockwood Branch | Guelph-Eramosa |
| Wellington Park Care Centre, Long Term Care Home | Burlington |
| Wellington Square United Church | Burlington |
| Wellington Square United Church, Community Hub and Lunch | Burlington |
| Wellmedica Oakville Town Centre Pharmacy, Pharmacy Services | Oakville |
| Wellspring, Online-Based Cancer Support | Toronto |
| Wellspring Birmingham Gilgan House, Community-Based Cancer Support | Oakville |
| Wellspring Church | Burlington |
| Wellwise by Shoppers Drug Mart, Burlington, Home Health Care Products | Burlington |
| Wellwise by Shoppers Drug Mart, Oakville, Home Health Care Products | Oakville |
| WeMove-It.com, Hoarding and Clutter Clean-up Services | Hamilton |
| Wentworth-Halton X-ray and Ultrasound, Burlington - Brant St, Diagnostic Imaging | Burlington |
| Wentworth-Halton X-ray and Ultrasound, Burlington - Appleby Line, Diagnostic Imaging | Burlington |
| Wentworth-Halton X-ray and Ultrasound, Burlington - Fairview St, Diagnostic Imaging | Burlington |
| Wentworth-Halton X-ray and Ultrasound, Burlington - Walker's Line, Diagnostic Imaging | Burlington |
| Wentworth-Halton X-Ray and Ultrasound, Oakville - Speers Rd, Diagnostic Imaging | Oakville |
| Wentworth-Halton X-Ray and Ultrasound, Oakville - Old Bronte Rd, Diagnostic Imaging | Oakville |
| WES For Youth Online, E-Counselling Mental Health Support Services | Brockton |
| Wesley, Housing Services – Halton | Halton Region |
| West End Studio Theatre | Oakville |
| West GTA Stroke Network | Etobicoke Central |
| West Harbour Residents' Association | Oakville |
| West Oakville Preschool Centre, Licensed Child Care Centre | Oakville |
| West Plains Medical and Pharmacy, Walk-in Medical Clinic | Burlington |
| West Plains Medical and Pharmacy, Pharmacy Services | Burlington |
| West Plains United Church | Burlington |
| West River Residents' Association | Oakville |
| Western Heights Montessori Academy, Old Bronte Campus, Licensed Child Care Centre | Oakville |
| Western Heights Montessori Academy, Maple Grove Campus, Licensed Child Care Centre | Oakville |
| Western Heights Montessori Academy, Morrison Campus, Licensed Child Care Centre | Oakville |
| Western Heights Montessori Academy, Oakhill Campus, Licensed Child Care Centre | Oakville |
| Western Heights Montessori Academy, Westoak Campus, Licensed Child Care Centre | Oakville |
| Western Ontario Highland Dancers Association, Halton-Hamilton/Wentworth District | Hamilton |
| Wheelchair In Motion | Selkirk |
| White Oaks Pharmacy, Pharmacy Services | Oakville |
| White Ribbon | Toronto |
| Widowed Friends | Halton Region |
| Wildwood Academy | Oakville |
| William Osler Health System, Peel Memorial Centre for Integrated Health and Wellness | Brampton |
| William Osler Health System, Peel Memorial Centre for Integrated Health and Wellness, Urgent Care Centre | Brampton |
| Williams Mill Creative Arts Studios, Glen Williams | Halton Hills |
| Willow Foundation (The) | Halton Region |
| Willow Park Ecology Centre | Halton Hills |
| Willowbrae Academy Oakville, Licensed Child Care Centre | Oakville |
| Windmill Microlending, Toronto Office | Toronto |
| Wings of Change - Peer Support, Peer Support for First Responders | Canada |
| Winston Park Medical Centre, Walk-in Medical Clinic | Oakville |
| Women of Halton Action Movement, Women's Advocacy Group | Oakville |
| Women's Care Abortion Clinic Toronto | North York West |
| Women's Centre of Halton (The), Oakville Office, Women's Support Services | Oakville |
| Women's Centre of Halton (The), Legal Clinic and Advocacy | Oakville |
| Women's Centre of Halton (The), Milton Office, North Halton Women's Support Services | Milton |
| Women's Centre of Halton (The), Oakville Office, Employment Services | Oakville |
| Women's Centre of Halton (The), Oakville Office, Support Groups and Workshops | Oakville |
| Women's Centre of Halton (The), One-on-One Support Services | Oakville |
| Women's College Hospital, Bay Centre for Birth Control | Toronto |
| Women's College Hospital, Crossroads Refugee Health Clinic | Toronto |
| Women's College Hospital, Mental Health Program, Reproductive Life Stages Program | Toronto |
| Women's College Hospital, Mental Health Program, Trauma Therapy Program | Toronto |
| Women's College Hospital, Sexual Assault / Domestic Violence Care Centre | Toronto |
| Women's College Hospital, Substance Use Service | Toronto |
| Women's College Hospital | Toronto |
| Women's Legal Education and Action Fund | Toronto |
| Womens Recreational Volleyball, Mailing Address | Milton |
| Women's Shelters Canada, No Physical Address, Tech Safety Canada | Ontario |
| Women's Shelters Canada, ShelterSafe.ca | Ottawa |
| Woodland Childrens Centre, Licensed Child Care Centre | Burlington |
| Woodview Medical Clinic, Walk-in Medical Clinic | Burlington |
| Woodview Mental Health and Autism Services | Burlington |
| Woodview Mental Health and Autism Services, Woodview Learning Centre | Burlington |
| Woodview Pharmacy, Pharmacy Services | Burlington |
| Workers' Action Centre | Toronto |
| Workers Health and Safety Legal Clinic | Toronto |
| Workplace Safety & Prevention Services, Mississauga - Main Office | Mississauga |
| Workplace Safety and Insurance Board, Toronto Office | Toronto |
| World Education Services | Toronto |
| World Renew | Burlington |
| Wounded Warriors Canada, Whitby Office | Whitby |
| Wyecroft Pharmacy, Pharmacy Services | Oakville |
| Wyndham Manor, Oakville, Long Term Care Residence | Oakville |
