| Name | Town/City | Postal Code |
| K2 Milling | Schomberg | L0G 1T0 |
| Kacaba Vineyards and Winery | Desboro | L0R 2C0 |
| Kai and Sharla Wiens | Niagara-on-the-Lake | |
| Kar-Dean Farms | Lincoln | L0R 2E0 |
| Katherine's Fresh Fruit | Niagara-on-the-Lake | L0S 1J0 |
| Katlun Yong | Sunderland | L0C 1H0 |
| Kemps Premium Meats | Blackstock | L0B 1B0 |
| Kennedy's Sugar Bush | Cavan-Millbrook-North Monaghan | L0A 1G0 |
| Kent Farms | Orono | L0B 1M0 |
| Kevin Finch | Sutton West | L0E 1R0 |
| Kind Organics | Schomberg | L0G 1T0 |
| King & Court Estate Winery | St. Catharines | L2R 6P9 |
| King Capon Ltd | Sharon | L0G 1V0 |
| Kings Court Catering | Bowmanville | L1C 1W3 |
| Kitcholm Farms | Moffat | L0P 1J0 |
| Kittling Ridge Estate Wines and Spirits | Grimsby | L3M 1Y6 |
| KJ Watson Farms | Toronto | |
| Klassen Vineyards | Toronto | |
| Klondike Kreek Beef Farms | Clearview | |
| Knox's Pumpkin Farm | Hampton | L0B 1J0 |
| Konzelmann Estate Winery | Niagara-on-the-Lake | L0S 1J0 |
| Kurtz Orchards Market | Niagara-on-the-Lake | L0S 1J0 |
