| D&K Footcare Services | Bradford West Gwillimbury |
| Daisy A Day Home Care, Barrie | Barrie |
| Dalhousie Youth Support Services | Peterborough |
| Danube Seniors Leisure Centre | Bradford West Gwillimbury |
| Dashwood Men's Club | Bluewater |
| Daughters of Isabella, Penetanguishene, Daughters of Isabella - Penetanguishene | Penetanguishene |
| Days For Girls, No Physical Address, Days For Girls Barrie | Barrie |
| DC Cab | Hanover |
| De Novo Treatment Centre | Huntsville |
| Deaf Access Simcoe Muskoka, Barrie Central Office, American Sign Language Classes | Barrie |
| Deaf Access Simcoe Muskoka, Barrie Central Office, American Sign Language Interpreting | Barrie |
| Deaf Access Simcoe Muskoka, Barrie Central Office, Community Support Services | Barrie |
| Deaf Access Simcoe Muskoka, Barrie Central Office | Barrie |
| Deaf Access Simcoe Muskoka, Barrie Central Office, Employment Services | Barrie |
| DeafBlind Ontario Services | Newmarket |
| Defined Spaces | Bracebridge |
| Delta Health Clinics, Barrie - Grove St E, Opioid Addiction / Dependence Treatment | Barrie |
| Delta Health Clinics, Barrie - Leacock Dr, Opioid Addiction / Dependence Treatment | Barrie |
| Delta Health Clinics, Barrie - Wellington St W, Opioid Addiction / Dependence Treatment | Barrie |
| Denim 'N Lace Square Dance Club | Grey Highlands |
| Dental Hygiene with Roma | Midland |
| Developmental Services Ontario, Bracebridge, North East Region | Bracebridge |
| Developmental Services Ontario, Central East Region, Aurora Office | Aurora |
| Diabetes Canada | Toronto Downtown Central |
| Diabetes Canada, D-Camps Ontario | Huntsville |
| Diabetes Grey Bruce | Owen Sound |
| Dialysis Management Clinics | Peterborough |
| Dick's Barber Shop | Stratford |
| Dietitians of Canada | Toronto Downtown Central |
| Dietitians of Canada - UnlockFood.ca | Toronto Downtown Central |
| Discount Taxi | Owen Sound |
| Discover Chiropractic | Stratford |
| Discovery Child Care Centre, Barrie - Thrushwood Dr, Child Care Centre | Barrie |
| Discovery Harbour, Penetanguishene | Penetanguishene |
| District 29 Senior Games, Burnside Agriplex, Stratford Lakeside Active Adults Association | Stratford |
| District of Muskoka, Bracebridge - Pine St, Administration Offices | Bracebridge |
| District of Muskoka, Bracebridge - Taylor Rd, Emergency Management Services | Bracebridge |
| District of Muskoka, Community and Planning Services Department, Bracebridge - Pine St | Bracebridge |
| District of Muskoka, Community Services - Ontario Works, Bracebridge - Pine St | Bracebridge |
| District of Muskoka, Community Transit Programs, Bracebridge - Pine St | Bracebridge |
| District of Muskoka, EarlyON Child and Family Centres, Bracebridge - No Physical Address | Bracebridge |
| District of Muskoka, Muskoka Ontario Renovates, Bracebridge - Pine St | Bracebridge |
| District of Muskoka, Specialized Transportation Fund, Bracebridge - Pine St | Bracebridge |
| District of Parry Sound Social Services Administration Board, Burk's Falls, EarlyON Child and Family Centre | Burk's Falls |
| District of Parry Sound Social Services Administration Board, West Parry Sound | |
| District of Parry Sound Social Services Administration Board, East Parry Sound, EarlyON Child and Family Centre | Machar |
| District of Parry Sound Social Services Administration Board, East Parry Sound, First Steps Early Learning and Child Care Centre | South River |
| District of Parry Sound Social Services Administration Board, East Parry Sound, Home Child Care Program - Children's Services | Machar |
| District of Parry Sound Social Services Administration Board, East Parry Sound, Ontario Works and Housing Stability Program | Machar |
| District of Parry Sound Social Services Administration Board, Highlands Early Learning and Child Care Centre, Licensed Early Learning and Child Care, Children's Services | Perry |
| District of Parry Sound Social Services Administration Board, Ontario Works and Housing Stability Program, West Parry Sound | |
| District of Parry Sound Social Services Administration Board, Parry Sound - 86 Gibson Street, EarlyON Child and Family Centre | Parry Sound |
| District of Parry Sound Social Services Administration Board, Parry Sound - 86 Gibson Street, Home Child Care Program - Children's Services | Parry Sound |
| District of Parry Sound Social Services Administration Board, Parry Sound - 86 Gibson Street, Inclusion Support Services | Parry Sound |
| District of Parry Sound Social Services Administration Board, Waubeek Early Learning and Child Care Centre, Licensed Early Learning and Child Care, Children's Services | Parry Sound |
| District of Parry Sound Social Services Administration Board, West Parry Sound, Housing Department | |
| Divine Landscape, Mobile Service, WasagaSnow.ca | Wasaga Beach |
| Dnaagdawenmag Binnoojiiyag Child and Family Services, Hiawatha - Admin Office | Hiawatha First Nation |
| Doe Lake Residence | Gravenhurst |
| Donaven Renovations, Lawn Care and Snow Blowing, Mobile Service | Wasaga Beach |
| Donegal Community Christian School | North Perth |
| Donna's Foot Care Services | Grey Highlands |
| Dooleys Taxi | Meaford |
| Dorset Heritage Museum | Dorset |
| Dorset Recreation Centre | Lake of Bays Township |
| Dorset Seniors' Club | Lake of Bays Township |
| Dorvict Home and Health Care Services, Barrie | Barrie |
| Doug's Home and Lawn Care, Mailing address | Wasaga Beach |
| Doula Group (The) | Barrie |
| Doula Services, Labour and Delivery Support | Midland |
| Douro-Dummer Seniors' Club | Douro-Dummer |
| Douro-Dummer. Municipal Office, Donwood, Fire Services | Douro-Dummer |
| Douro-Dummer. Municipal Office, Douro - 4th Line, Douro-Dummer Public Library | Douro-Dummer |
| Douro-Dummer. Municipal Office, Douro - 4th Line, Fire Services | Douro-Dummer |
| Douro-Dummer. Municipal Office, Douro-Dummer Historical Committee, Douro - 4th Line | Douro-Dummer |
| Douro-Dummer. Municipal Office, Dummer -6th Line Rd N Dummer, Fire Services | Douro-Dummer |
| Douro-Dummer. Municipal Office, Warsaw - South St, Douro-Dummer Municipal Office | Douro-Dummer |
| Dove's Nest Thrift Store | South Huron |
| Down Syndrome Association of Peterborough, Lansdowne St W, Recreational and Social Programs | Peterborough |
| Down Syndrome Association of Peterborough, Lansdowne St W, Wee Ups & Downs | Peterborough |
| Down Syndrome Association of Simcoe County, Mailing Address | Barrie |
| Downtown Barrie BIA, Barrie | Barrie |
| Downtown Goderich BIA | Goderich |
| Downtown Huntsville BIA | Huntsville |
| Downtown Midland Business Improvement Area | Midland |
| Downtown Orillia Management Board | Orillia |
| Downtown Youth Space | Peterborough |
| dp Music Therapy | Bluewater |
| Dr. Dianne Maing Psychologist, Barrie | Barrie |
| Dragon Boat Barrie (Ontario), Mailing Address | Barrie |
| Drayton Entertainment, King's Wharf Theatre | Penetanguishene |
| Dress for Success, Barrie | Barrie |
| Drive A Boat Canada, Safe Boating Courses | Gravenhurst |
| Driverseat | Barrie |
| Driverseat Inc, Woodstock - No Physical Address | Woodstock |
| Driverseat Owen Sound, Mailing address | Owen Sound |
| DriveTest, Collingwood, Driver Examination Centre, Collingwood | Collingwood |
| DriveTest, Orangeville, Driver Examination Centre, Orangeville | Orangeville |
| DriveTest, Orillia, Driver Examination Centre | Orillia |
| DriveTest, Owen Sound, Driver Examination Centre, Owen Sound | Owen Sound |
| DriveTest, Peterborough, Driver Examination Centre, Peterborough | Peterborough |
| DriveTest, Port Hope | Port Hope (Municipality of) |
| Drivetest, Stratford | Stratford |
| DriveTest, Walkerton, Driver Examination Centre, Walkerton | Brockton |
| DriveTest / Serco Des | Barrie |
| DriveTest / Serco Des, Barrie, Driver Examination Centre | Barrie |
| DriveTest Driver Examination Centre, Huntsville | Huntsville |
| DriveTest, Clinton, Driver Examination Centre, Clinton | Central Huron |
| Driving Miss Daisy Seniors' Services, Mobile Service | Peterborough |
| Drug Basics, Stratford | Stratford |
| D-tek-TION Security Systems, Mobile Service | Barrie |
| Dublin & District Lions Club | West Perth |
| Ducks Unlimited Canada, Barrie | Barrie |
| Dufferin Area Family Health Team | Dufferin County |
| Dufferin Child and Family Services | Orangeville |
| Dufferin Child and Family Services, Child and Youth Mental Health Crisis Line | Orangeville |
| Dufferin Child and Family Services, Child and Youth Mental Health | Orangeville |
| Dufferin Child and Family Services, Child Protection | Orangeville |
| Dufferin Child and Family Services, Complex Special Needs Support Program | Orangeville |
| Dufferin Child and Family Services, Developmental Support Services Coordination Program | Orangeville |
| Dufferin Child and Family Services, Headwaters Family Visit Centre | Orangeville |
| Dufferin Child and Family Services, Infant and Child Development Program | Orangeville |
| Dufferin Child and Family Services, Medically Fragile Technologically Dependent Day Respite Program | Orangeville |
| Dufferin County Cultural Resource Circle | Orangeville |
| Dufferin County., Orangeville - Head Office, Municipal Office | Orangeville |
| Dufferin County., Grand Valley, EarlyON Child and Family Centre | Grand Valley |
| Dufferin County., Museum of Dufferin | Mulmur |
| Dufferin County., Road Conditions | Dufferin County |
| Dufferin County., Orangeville - Ambulance Headquarters, Paramedic Service | Orangeville |
| Dufferin County., Orangeville - Edelbrock Centre, Social Housing - Homelessness Prevention Programs | Orangeville |
| Dufferin County., Orangeville, EarlyON Child and Family Centre | Orangeville |
| Dufferin County., Shelburne - Mel Lloyd Centre, Community Support Services | Shelburne |
| Dufferin County., Shelburne, EarlyON Child and Family Centre | Shelburne |
| Dufferin Food Share Grand Valley Food Bank | Grand Valley |
| Dufferin Parent Support Network | Orangeville |
| Dufferin Simcoe Land Stewardship Network | Mulmur |
| Dufferin, County of, Orangeville - Ambulance Headquarters, Community Paramedic Service | Orangeville |
| Dufferin, County of, Orangeville - Edelbrock Centre, Canada-Ontario Housing Benefit | Orangeville |
| Dufferin, County of, Orangeville - Edelbrock Centre, Child Care Fee Subsidy | Orangeville |
| Dufferin, County of, Orangeville - Edelbrock Centre, Employment Resource Centres | Orangeville |
| Dufferin, County of, Orangeville - Edelbrock Centre, Ontario Works | Orangeville |
| Dufferin, County of, Orangeville - Edelbrock Centre, Raising the Bar | Orangeville |
| Dufferin, County of, Orangeville - Edelbrock Centre, Social Housing - Homeownership Program | Orangeville |
| Dufferin, County of, Orangeville - Edelbrock Centre, Social Housing - Housing Access Dufferin | Orangeville |
| Dufferin, County of, Orangeville - Edelbrock Centre, Social Housing - Ontario Renovates | Orangeville |
| Dufferin, County of, Orangeville - Head Office, Emergency Management Office | Orangeville |
| Dufferin, County of, Orangeville - Head Office, Waste Services | Orangeville |
| Dufferin, County of, Shelburne - Mel Lloyd Centre, Community Support Services - Adult Day Program | Shelburne |
| Dufferin, County of, Shelburne - Mel Lloyd Centre, Community Support Services - Friendly Visiting | Shelburne |
| Dufferin, County of, Shelburne - Mel Lloyd Centre, Community Support Services - Home Help | Shelburne |
| Dufferin, County of, Shelburne - Mel Lloyd Centre, Community Support Services - Home Maintenance | Shelburne |
| Dufferin, County of, Shelburne - Mel Lloyd Centre, Community Support Services - Meals on Wheels | Shelburne |
| Dufferin, County of, Shelburne - Mel Lloyd Centre, Community Support Services - Transportation | Shelburne |
| Dunchurch Community Centre | Whitestone |
| Dundalk and District Food Bank, Christmas Cheer | Southgate |
| Dundalk and District Food Bank | Southgate |
| Dundalk Fire Department | Southgate |
| Dundalk Village Pharmacy | Dundalk |
| Dundalk Wesleyan Church | Southgate |
| Dungannon Agricultural Society | Ashfield-Colborne-Wawanosh |
| Dunsford Food Bank | Kawartha Lakes |
| Dunsford Seniors | Kawartha Lakes |
| Duntroon Day Care | |
| Durham and District Food Bank, Christmas Assistance | West Grey |
| Durham and District Food Bank | West Grey |
| Durham College | Oshawa |
| Durham Deaf Services | Oshawa |
| Durham Silver Threads Seniors' Club #64, Durham Town Hall | |
| Dying with Dignity Canada | Toronto |
| Dynacare, Goderich, Laboratory Services & Health Centre | Goderich |
| Dynacare, Seaforth, Laboratory Services | Seaforth |
| Dynacare Medical Laboratory, Huronia Medical Centre Laboratory | Midland |
| Dynamic Neurophysiotherapy, Mobile Service, Mobile Physiotherapy | Barrie |
| Dysart et al. Municipal Office, Haliburton - Maple Ave, By-law Department and Animal Control | Haliburton |
| Dysart et al. Municipal Office, Haliburton - Maple Ave | Haliburton |
| Dysart et al. Municipal Office, Haliburton - Maple Ave, Waste Management | Haliburton |
| Dysart et al. Municipal Office, Haliburton - South St, Volunteer Fire Department | Haliburton |
| Dysart et al. Municipal Office, Parks & Recreation Department, Haliburton - Maple Ave | Haliburton |