| | Organization Name(s) | Located In |
| | La Leche League Canada | York Region |
 | La Maison Montessori House | Aurora |
| Ladies Fun Volleyball | Newmarket |
| Ladies' Golf Club of Toronto Ltd. | Thornhill |
| Ladies Newmarket Basketball Association | Newmarket |
| Ladies of the Lake | Aurora |
| Lake Simcoe Conservation Foundation | Newmarket |
| | Lake Simcoe Minor Softball Association | Georgina |
| Lake Simcoe Region Conservation Authority | Newmarket |
| Lake Simcoe Region Conservation Authority, Rogers Reservoir Conservation Area | Newmarket |
| Lake Simcoe Soccer Club | Georgina |
| | Lakeview Estates Ratepayers Association | Vaughan |
| LAMP ASK! Community Information Centre | Etobicoke |
| Landlord Self Help Centre | Toronto |
| Landsberg Lewis Housing Co-operative, Community Services and Housing, York Region | Richmond Hill |
| | Langstaff Community Association Inc | Thornhill |
| L'Arche Canada | Richmond Hill |
| L'Arche Daybreak | Richmond Hill |
| Laser Quest Sci-Fi Adventure Game | Richmond Hill |
| Latcham Gallery | Stouffville |
| Law Society of Upper Canada | Toronto |
| Le Parc Conference and Banquet Centre | Markham |
| | Leaps and Bounds, Specialized Programming Services | Richmond Hill |
| Learning Centre for Georgina | Georgina |
| Learning Disabilities Association of York Region | Richmond Hill |
| | Leash Free Markham Committee | Markham |
| Leckie Hearing Services, Audiology | Richmond Hill |
| Legacy Community Ratepayers Association | Markham |
| Legal Aid Ontario, York Region Office | Richmond Hill |
| | Legal Line | Canada |
| Leisureworld Caregiving Centre | Markham |
| Leisureworld Caregiving Centre - Vaughan | Vaughan |
| | Leitchcroft Ratepayers Association | Thornhill |
| | Lesbian Gay Bi Trans Youth Line | Toronto |
| Liberal Party of Canada (Ontario) | Toronto |
| Life Skills Education and Progressive Arts Program, Intellectual Disabilities | Richmond Hill |
| Life With A Baby | Thornhill |
| LifeCorps Food Share | Richmond Hill |
| | LifeCorps International | Richmond Hill |
| LifeLabs, Markham | Markham |
| LifeLabs, Richmond Hill | Richmond Hill |
| LifeLabs, Thornhill | Thornhill |
| LifeLabs Medical Laboratory Services | Aurora |
| LifeLabs Medical Laboratory Services | Aurora |
| Lifesaving Society - Ontario Branch | Toronto |
| Lionels Equestrian Centre and Pony Farm | Stouffville |
| Lioness Club, Pefferlaw | Pefferlaw |
| Lioness Club Richvale | Richmond Hill |
| Lions Club, Aurora, Pancake Breakfast | Aurora |
| | Lions Club, Keswick 32523 | Keswick |
| | Lions Club, Markham | Markham |
| | Lions Club, Milliken Mills | Markham |
| Lions Club, Pefferlaw 41990 | Georgina |
| Lions Club, Sutton West and District 49554 | Georgina |
| Lions Club Oak Ridges | Richmond Hill |
| | Lions Club of Central Richmond Hill | Richmond Hill |
| | Lions Club, Thornhill District | Thornhill |
| Lions Foundation of Canada - Guide Dogs | Oakville |
| Literacy Council York South | Thornhill |
| Literacy Council York-Simcoe | Newmarket |
| Little School House (The) | Richmond Hill |
| Living Water Counselling Centre | Richmond Hill |
| Living Water Faith Fellowship | Gormley |
| | Lloydtown Rebellion Association | King City |
| Lo Specchio | Woodbridge |
| | Local Architectural Conservation Advisory Committee, LACAC | Richmond Hill |
| | Local Genealogy Sources | York Region |
| Local Health Integration Network | Markham |
| | Localwork.ca | |
| Locust Hill Cemetery | Markham |
| Locust Hill United Church | Markham |
| LOFT Crosslinks Housing and Support Services, York Region Street Outreach Van | York Region |
| Logos Baptist Church (York Region) | Richmond Hill |
| Logos Baptist Church. Markham | Markham |
| | Long and short distance running events in York Region and area | York Region |
| Loretto Maryholme Spirituality Centre | Georgina |
| Loving Care Centre | Thornhill |
| Low-Income Energy Network | Toronto |
| Loyal True Blue & Orange Home | Richmond Hill |
| Lung Association, York Region | Toronto |
| Lupus Canada | Markham |
| Lupus Ontario | Markham |
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