| | Organization Name(s) | Located In |
 | W Ross Macdonald School, Ontario School for the Blind | Brantford |
| Wal-Mart | Richmond Hill |
| War Child Canada | Toronto |
| | Ward One (South) Thornhill Residents Inc., Pomona Mills Park Conservationists | Thornhill |
| Wee Watch Enriched Home Child Care, Aurora, King | Aurora |
| Weight Watchers | Richmond Hill |
| Welcome Centre Immigrant Services, Markham North | Markham |
| Welcome Centre Immigrant Services, Markham South | Markham |
| Welcome Centre Immigrant Services, Newmarket | Newmarket |
| Welcome Centre Immigrant Services, Richmond Hill | Richmond Hill |
| Welcome Centre Immigrant Services, Vaughan | Vaughan |
| | Welcome Wagon, Aurora, East Gwillimbury, Georgina, King Township, Markham, Newmarket, Richmond Hill, Vaughan, Whitchurch-Stouffville | Aurora |
| Welcoming Arms | Aurora |
| Wellington Medical Walk In Clinic | Aurora |
| Wellness First | Markham |
| Wellspring | Toronto |
| | What Older Women Want, Knowledge-to-Action Project | Canada |
| Wheelchair Accessible Transit Inc | Thornhill |
| | Where Women Connect | York Region |
| Whitby Central Library | Whitby |
| Whitchurch-Stouffville Dart League | Stouffville |
| Whitchurch-Stouffville Fire and Emergency Services | Stouffville |
| Whitchurch-Stouffville Food Bank | Stouffville |
| Whitchurch-Stouffville Heritage Advisory Committee | Whitchurch-Stouffville |
| | Whitchurch-Stouffville Minor Hockey Association | Stouffville |
| Whitchurch-Stouffville Newcomers' Club | Stouffville |
| Whitchurch-Stouffville Public Library | Stouffville |
| | Whitchurch-Stouffville Soccer Club | Stouffville |
| | Whitchurch-Stouffville Softball Association (WSSA) | Stouffville |
| | Whitchurch-Stouffville Umpires Association | Stouffville |
| Whitchurch-Stouffville, Town of, Municipal Building | Stouffville |
| Whitchurch-Stouffville, Town Of. Ballantrae Community Centre | Stouffville |
| Whitchurch-Stouffville, Town Of. Lemonville Community Centre | Stouffville |
| White Heather Pipes & Drums | Aurora |
| Wideman Mennonite Cemetery | Markham |
| Wideman Mennonite Church | Markham |
| William Lyon Mackenzie Co-operative Housing | Thornhill |
| William Osler Health Centre | Toronto |
| Willowbrook Badminton Club | Thornhill |
| Willowgrove Centre | Stouffville |
| Willows Estate Nursing Home | Aurora |
| Windfall Ecology Centre | Aurora |
| Windfall Ecology Centre | Aurora |
| | Wismer Ratepayers Association | Markham |
| Women's Centre of York Region | Newmarket |
| Women's College Hospital | Toronto |
| Women's College Hospital, Women's Health Matters Website | Toronto |
| Women's College Hospital, Women's Health Resource | Toronto |
| | Women's Committee of Markham | Markham |
| Women's Health In Women's Hands | Toronto |
| Womens Learning Institute | Woodbridge |
| Women's Support Network of York Region | Newmarket |
| | Woodbridge Core Ratepayers Association | Woodbridge |
| Woodbridge Fall Fair | Woodbridge |
| Woodbridge Figure Skating Club | Woodbridge |
| Woodbridge Lions Club | Woodbridge |
| Woodbridge Oxford Learning Centre, Woodbridge Branch | Woodbridge |
| Woodhaven (The) | Markham |
| Woolwich Community Services | Elmira |
| Workforce Planning Board of York Region & Bradford West Gwillimbury | Newmarket |
| Workplace Safety and Insurance Board | Toronto |
| Workplace Safety and Prevention Services | Toronto |
| World Education Services | Toronto |
| World Vision Canada | Mississauga |
| World Wildlife Fund, WWF | Toronto |
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