| | Organization Name(s) | Located In |
 | Walc, Dr. L. | Penetanguishene |
 | Walmart Pharmacy. Midland | Midland |
 | War Amps (The) | Ottawa |
| | Warren (Dr John) | Midland |
| | Warren (Wanda L) | Penetanguishene |
 | Wasaga Beach Ministerial Food Bank | Wasaga Beach |
 | Wasaga Beach Ministerial Food Bank, Christmas Assistance | Wasaga Beach |
| | Wasaga Beach Soccer Club | Wasaga Beach |
 | Wasaga Pines Family Campground | Elmvale |
 | Waterside Management Incorporated | Midland |
 | Waubaushene and District Lions Club | Waubaushene |
 | Waubaushene Elementary School | Waubaushene |
| | Waubaushene Running Club | Waubaushene |
| | Waverly Caregiver Employment & Services | Elmvale |
 | Waypoint Centre for Mental Health Care | Penetanguishene |
 | Waypoint Centre for Mental Health Care, Bayview Dual Diagnosis Program | Penetanguishene |
 | Waypoint Centre for Mental Health Care, Georgianwood Program for Concurrent Disorders | Penetanguishene |
 | Waypoint Centre for Mental Health Care, Geriatric Services Program | Penetanguishene |
 | Waypoint Centre for Mental Health Care, Housing Services (Homes for Special Care Program) | Midland |
 | Waypoint Centre for Mental Health Care, Outpatient Services Program | Midland |
 | Waypoint Centre for Mental Health Care, Outpatient Services Program, Transitional Age Youth Tele-psychiatry Consultation Service | Midland |
 | Waypoint Centre for Mental Health Care, Psychiatric Patient Advocate Office | Penetanguishene |
 | Waypoint Centre for Mental Health Care, Regional and Community Rehabilitation Services, Adult Education Program, Regional Client Education | Simcoe North |
 | Waypoint Centre for Mental Health Care, Rehabilitation Services, Employment and Education Services | Midland |
 | Waypoint Centre for Mental Health Care, Rehabilitation Services, Our Place Social Club | Midland |
 | Waypoint Centre for Mental Health Care, Rehabilitation Services, Recreational Services | Midland |
 | Waypoint Centre for Mental Health Care, Shuttle Bus Service | Penetanguishene |
 | Waypoint Centre for Mental Health Care, Spiritual Care Team | Penetanguishene |
 | Waypoint Centre for Mental Health Care, Volunteer Resources | Penetanguishene |
 | We Care Home Health Services | Barrie |
 | Wee Watch- Orillia/Midland | Orillia |
 | Weight Watchers. Midland | Midland |
| | Welcome Wagon. Elmvale Area | Elmvale |
| | Welcome Wagon. Midland/Penetanguishene | Penetanguishene |
 | Wendat | Midland |
 | Wendat, Crisis Services | Midland |
 | Wendat, Housing Registry | Midland |
 | Wendat, Psychogeriatric Services | Midland |
 | Wendat, Support for Independent Living Program | Midland |
 | Wendat, Supported Housing for Seniors | Midland |
 | Wendat, Wendat Social Club | Midland |
 | Wendat, Wendat Supported Employment Program | Midland |
 | Wendat Assisted Living Program | Midland |
 | Wendat Services for Seniors, Wendat Congregate Dining Program | Midland |
 | Wendat Services for Seniors, Wendat Seniors Day Program | Midland |
 | Wheelchair Taxi | Mississauga |
 | Wheels 4 Wheels, Huronia Seniors Volunteer Care Team | Midland |
 | Whitchurch-Stouffville Public Library | Stouffville |
 | White Pines Golf & Fishing | Lafontaine |
 | Whitfields Guardian Pharmacy | Elmvale |
 | Wildfire Outdoor Education Centre. North Simcoe, Hatts Off Specialized Services | Wyevale |
 | Williams Farm | Wyebridge |
 | Willow Breast Cancer Support Canada | Toronto |
 | Willow Creek Baptist Church, Midhurst | Midhurst |
 | Willow Creek Baptist Church. Midhurst, Children's Summer Day Camps | Midhurst |
 | Wind Song Orchard | Clearview |
 | Winter (John J) | Midland |
| | With Open Arms, Apetito Community Meals | Barrie |
| | Women and Children's Shelter of Barrie | Barrie |
 | Women's Centre (Grey & Bruce) (The) | Owen Sound |
 | Women's Centre (Grey & Bruce) (The), Family Court Support Worker Program | Owen Sound |
| | Women's Institutes, Simcoe Area | Simcoe County |
| | Women's Slo-Pitch League. Victoria Harbour | Victoria Harbour |
 | womenshealthmatters.ca | Toronto |
 | Woods (Dr Donald) | Penetanguishene |
 | Woods Park Care Centre | Barrie |
 | Wood's U-Pick | Wyebridge |
 | Woolwich Community Services | Elmira |
 | Workplace Safety and Insurance Appeals Tribunal | Toronto |
 | Workplace Safety and Insurance Board. Ontario, Toronto Head Office | Toronto |
 | World Vision Canada, Special Events Program | Mississauga |
 | World Vision Canada. National Office | Mississauga |
 | Wycliffe Anglican Church. Elmvale, Anglican Church Women | Elmvale |
 | Wye Marsh Association of Woodcarvers | Midland |
 | Wye Marsh Wildflower Gardeners | Midland |
 | Wye Marsh Wildlife Centre | Midland |
 | Wye Marsh Wildlife Centre, Camp Wetlands and Wildthings | Midland |
| | Wye Marsh Wildlife Centre, Sweetwater Harvest Weekend | Midland |
 | Wyevale Central Public School | Wyevale |