| Lakefield and District Horticultural Society | Lakefield |
| Lakefield Badminton Club | Peterborough |
| Lakefield Community Food Bank | Selwyn Township |
| Lakefield Golden Years Club | Selwyn Township |
| Lakefield Heritage Research | Peterborough |
| Lakefield Historical Society, Lakefield - Mailing Address | Lakefield |
| Lakefield Jazz, Art & Craft Festival | Selwyn Township |
| Lakefield Physiotherapy and Foot Health Clinic | Lakefield |
| Lakefield Trail Stewardship Committee | Selwyn Township |
| Lakeridge Health Corporation, Oshawa, Pinewood Centre, Mental Health and Addictions Program at Lakeridge Health | Oshawa |
| Lakeridge Health Oshawa, Indigenous Navigator | Oshawa |
| Lang Pioneer Village Museum | Otonabee-South Monaghan |
| Law Society of Ontario, Law Society Referral Service | Toronto Downtown Central |
| Learning In Leisure Peterborough | Peterborough |
| Legal Aid Ontario, Peterborough - 364 Water St, Peterborough Area Legal Aid Office | Peterborough |
| Legal Aid Ontario, Peterborough - 470 Water St, Duty Counsel Office (Family), Peterborough - 470 Water St | Peterborough |
| Legal Aid Ontario, Peterborough - 70 Simcoe St, Duty Counsel Office (Criminal), Peterborough - 70 Simcoe St | Peterborough |
| Leta Brownscombe Co-operative Homes Inc., Leta Brownscombe Co-operative Homes Inc | Peterborough |
| Life After Stroke, Peterborough, Life After Stroke Peterborough | Peterborough |
| Lifewalk | Peterborough |
| Lift Lock Square Dance Club | Peterborough |
| Liftlock Foodland | Peterborough |
| Lighthouse Retreat, Peterborough - Sherbrooke Heights Retirement Residence | Peterborough |
| Lions Club of Peterborough, Peterborough Lions Community Centre | Peterborough |
| Living Hope Christian Reformed Church | Peterborough |
| Living Well Home Medical Equipment, Peterborough | Peterborough |
| Lovesick Lake Native Women's Association | Selwyn Township |
| Lung Health Foundation | Ontario |
| Lutheran Church-Canada, Christ Evangelical Lutheran Church | Peterborough |
