| La Leche League, Online Service, Find a La Leche League Group | Ontario |
| Lakeshore Woods Medical Clinic | Oakville |
| Lakeside Volleyball Club | Oakville |
| Landscape Ontario, Horticultural Technician Apprenticeship | Milton |
| Lao Association of Ontario | Toronto |
| Laureate College | Burlington |
| Laurier Medical and Walk In Clinic | Milton |
| Lawn Bowls Milton | Milton |
| Lawson Park Family Tennis Club | Oakville |
| Learning Disabilities Association of Ontario | Etobicoke |
| Legal Aid Ontario, Refugee Law Office | Toronto |
| Les Coccinelles, EarlyON Child and Family Centre | Milton |
| Lesbian Gay Bi Trans YouthLine, Text and Chat YouthLine | Toronto |
| Leukemia and Lymphoma Society of Canada - Ontario Region | North York East |
| Leukemia and Lymphoma Society of Canada - Ontario Region - First Connection Peer Support | North York East |
| LGBTQ+ Youth HeLP, Health Information Website | Ottawa |
| Lighthouse for Grieving Children and Families, Grief and Bereavement Support Services | Oakville |
| Links2Care, Acton - Wallace St, EarlyON Child and Family Centre | Acton |
| Links2Care, Acton Cobblehill Cooperative, EarlyON Child and Family Centre | Acton |
| Links2Care, Acton Community Hub, Care at Home for Seniors and Adults with Disabilities | Acton |
| Links2Care, Acton Community Hub, EarlyON Child and Family Centre | Acton |
| Links2Care, Georgetown - James St, EarlyON Child and Family Centre | Georgetown |
| Links2Care, Georgetown Community Hub, Care at Home for Seniors and Adults with Disabilities | Halton Hills |
| Lions Valley Athletics | Oakville |
| LiveYoung Mediclinic, Family Practice and Walk-in Clinic | Milton |
| Local Transit and Bus Services in Halton Region | Halton Region |
| Lung Health Foundation | North York East |
| Lyme Ontario | Ancaster |
| LymeHope | Burlington |
| Lymphedema Association of Ontario | Etobicoke South |
