| Faith Fellowship Baptist Church, Baptist Church Aurora | Aurora |
| Family and Credit Counselling Services | Thornhill East |
| Family Day, EarlyON Child and Family Centre Thornhill | Thornhill East |
| Family Day, Markham EarlyON Child and Family Centres, Markham EarlyON Child and Family Centre | Markham |
| Family Education Resource Network | Markham |
| Family Place, (The), Mount Albert Community Centre | Mount Albert |
| Family Services York Region, Newmarket - Head Office | Newmarket |
| Family Services York Region, Georgina Office | Sutton |
| Family Services York Region, Markham Office | Markham |
| Family Services York Region, Richmond Hill - Bayview Office | Richmond Hill |
| Family Support Network Newmarket Aurora | Newmarket |
| Farley Foundation | Milton |
| FDMT, Online - Mailing Address, Educational, therapy and sensory tools and supplies | Québec |
| Federation of Chinese Canadians In Markham | Markham |
| Fem'aide : Francophone helpline for women affected by violence | Ontario |
| Fibromyalgia and Chronic Fatigue Syndrome Support of York Region | Richmond Hill |
| Field of Dreams Baseball, Mailing Address | York Region |
| Filipino-Canadian Association of Vaughan | Vaughan |
| Findhelp Information Services, 211 Central Region Contact Centre | Toronto Downtown North |
| FLATO Markham Theatre | Markham |
| Fletcher's Fields | Markham |
| FLK Taoist Tai Chi, FLK Taoist Tai Chi Newmarket | Newmarket |
| Food Addicts in Recovery Anonymous - Woodbridge | Vaughan |
| Foot Care Extraordinaire, Mobile Service | Newmarket |
| Forestview Retirement Residence | North York West |
| Forever Thyme Sanctuary | Whitchurch-Stouffville |
| Forgotten Ones Cat Rescue and Adoption Inc | Richmond Hill |
| Foundation for Prader-Willi Research Canada | Richmond Hill |
| Four Elms Retirement Residence | Thornhill West |
| FrancoQueer | Toronto Downtown Central |
| Free Methodist Church of Canada, Belhaven Free Methodist Church | Georgina |
| Freedom From Addiction | Aurora |
| French Alliance of Toronto, Markham Campus | Markham |
| French Solutions | Markham |
| Friends of the East Gwillimbury Library | Holland Landing |
| Friends of the Library, Peter Gzowski Library | Georgina |
| Friends of We Care | Concord |
| Friendship Circle of Toronto, Chabad Gate | Thornhill West |
| Fuerza Latina | Maple |
| Full Access Network, FAN Day Program | Newmarket |
| Fung Loy Kok Institute of Taoism | Markham |
| Future Possibilities for Kids | Toronto |