| Name | Town/City | Postal Code |
| D & W Cooper Farms | Uxbridge | L9P 1R3 |
| D. Smith and Son - Two Century Farm | Grimsby | L3M 1T2 |
| Daryl Phoenix | Brock | L0C 1H0 |
| Datars | Ancaster | |
| De Sousa Wines | Beamsville | L0R 1B0 |
| Dearsley's Meats Limited | Lynden | L0R 1T0 |
| Deer Ridge Farms | Jordan Station | L7G 4V4 |
| DeVries Fruit Farm | Fenwick | L0S 1C0 |
| Dim Vineyards | Jordan Station | L0R 1S0 |
| Disley Food Services | King | M1S 3P8 |
| Diversity Farms | Gormley | L0H 1G0 |
| Dixie Orchards | Caledon | L7C 2M8 |
| Dixie Orchards | Caledon | L7C 2M8 |
| Doig Farms | Trent Hills | L2R 6P9 |
| Don Watson | Millgrove | L0R 1V0 |
| Donato Harvest | Tottenham | L0G 1W0 |
| Doug Shaw | Clarksburg | N0H 1J0 |
| Downeys Farm Market | Caledon | |
| Drummond Farms/Belvedere Orchards | Waterdown | L0R 2H1 |
| Duffin Appleworks | Welland | L3B 5N5 |
| Durham Foods | Port Perry | L9L 1B3 |
| Dutch Mill Gardens and Country Market | Millgrove | L0R 1V0 |
| Dutchman's Gold Inc | Carlisle | L0R 1H2 |
