| Organization Name(s) | Located In |
| La Clé d'la Baie, Vague FM 88.1 | Penetanguishene |
| La Clé d'la Baie en Huronie, Service à la petite enfance/Francophone Ontario Early Years Service | Penetanguishene |
| La Leche League Canada. Midland/Penetanguishene Group | Midland |
| L'academie La Pinede | Borden CFB |
| Ladies of the Lake Conservation Association | Ontario |
| Ladies Orange Benevolent Association, Rebecca Bower 1136 | Alliston |
| Laestadian Lutheran Church | Cookstown |
| Lake Simcoe Living Magazine | Barrie |
| Lake Simcoe Region Conservation Authority | Newmarket |
| Lake Simcoe Region Conservation Authority, Landowner Environmental Assistance Program | Newmarket |
| Lake Simcoe Region Conservation Authority, Professor E A Smith Natural Resources Education Centre | Bradford West Gwillimbury |
| Lake Simcoe Region Conservation Authority, Scanlon Creek Conservation Area | Bradford West Gwillimbury |
| Lake Simcoe Region Conservation Authority, Summer Nature Program, Conservation Kids | Aurora |
| Lake Simcoe Regional Airport | Oro Station |
| Lakehead Social Planning Council, 211 Ontario North | Thunder Bay |
| Lakeside Retirement at Innisfil | Innisfil |
| LAMP - ASK! Community Information Centre | Etobicoke South |
| Landlord and Tenant Board, Toronto North District Office | Toronto |
| Landlord's Self-Help Centre | Toronto |
| Last Call Designated Driving Service | Barrie |
| Laurentian University at Georgian, Orillia Campus | Orillia |
| Law Society of Upper Canada (The) | Toronto |
| Law Society of Upper Canada (The), Law Society Referral Service | Toronto |
| Leaps and Bounds, Specialized Programming Service | York Region |
| Learning Centres, Alliston Campus | Alliston |
| Learning Centres, Alliston Campus, Literacy and Basic Skills | Alliston |
| Learning Centres, Barrie Campus | Barrie |
| Learning Centres, Bradford Campus | Bradford |
| Learning Centres, Bradford Campus, Literacy and Basic Skills | Bradford |
| Learning Disabilities Association of Simcoe County | Simcoe County |
| Leblanc Rest Home | Bradford |
| Lefroy Minor Hockey Association | Innisfil |
| Lefroy Skating Club | Lefroy |
| Lefroy United Church | Innisfil |
| Legal Aid Ontario, Central District Office | Barrie |
| Legal Aid Ontario, Central District Office, Barrie Location, Advice Lawyer for Family Law | Barrie |
| Legal Aid Ontario, Central District Office, Criminal Law Office | Barrie |
| Leisureworld Caregiving Centre. Creedan Valley | Creemore |
| Lesbian Gay Bi Trans Youth Line | Toronto |
| LGBT Youth Connection Barrie | Barrie |
| Lice Squad Canada | Innisfil |
| Life and Times News Magazine Group | Barrie |
| Life Skills and Independence for Teens | Midland |
| LifeLabs, Alliston | Alliston |
| Lighthouse Baptist Church | Alliston |
| Lighthouse Christian Ministries | Orillia |
| Lindsay (Lawrence), Piano Instructor | Alliston |
| Lindsey (Dr Cameron A) | Beeton |
| Links2Care, Acton Office | Acton |
| Liquor Control Board of Ontario | Toronto |
| Lisle Community Hall | Adjala-Tosorontio |
| Literacy Council of South Simcoe | Alliston |
| Literacy Council of South Simcoe, Literacy and Basic Skills | Alliston |
| Little Angels Lactation Support | Elmvale |
| LIVESTRONG, Barrie Group | Barrie |
| Living Faith Community Presbyterian Church | Baxter |
| Living in Balance | Midland |
| Lo (Dr Ian) | Beeton |
| Locomotion Day Care Centre | Tottenham |
| Look Good Feel Better | Barrie |
| Low-Income Energy Assistance Program (LEAP), Simcoe County | Simcoe County |
| Loyal Orange Lodge, Tottenham Rich Hill Branch 359 | Tottenham |
| Loyal Orange Lodge. Ivy Local 450 | Essa |
| Lupus Foundation of Ontario | Ridgeway |