| | Organization Name(s) | Located In |
 | L-1 Identity Solutions, Niagara Falls Office | Niagara Falls |
| | L3K Wildlife Restoration Foundation, Wildlife Habitat Restoration Project | Port Colborne |
 | La Boîte à soleil, Empress | Welland |
 | La Boîte à soleil, Garderie Fitch | Welland |
 | La Boîte à soleil, LaMarsh | Niagara Falls |
 | La Boîte à soleil, Nouvel Horizon | Welland |
 | La Boîte à soleil, Saint Joseph | Port Colborne |
| | La Leche League Canada, Niagara Region | Niagara Region |
 | La petite etoile de Niagara Inc | Niagara Falls |
 | La Résidence des Ainés Canadiens francais Inc | St Catharines |
 | La Residence Joie de Vivre Inc | Niagara Falls |
| | Lakeshore 50 Plus | St Catharines |
 | Lakeshore Baptist Church | St Catharines |
 | Lakeview Community Daycare Cooperative | Grimsby |
| | Lams Niagara - Ladies Association Multiple Sclerosis | St Catharines |
 | Land Care - Niagara | Welland |
 | Landlord's Self-Help Centre | Toronto (City of) |
 | Lane Stamp Ski Club | Niagara Falls |
| | Language Interpreter Services (LIS) | Ontario |
| | Lao Association | St Catharines |
 | Lao Christian Fellowship | St Catharines |
| | Latin Immigrant Niagara Community Association, LINCA | St Catharines |
| | Laurier Liberal Ladies | St Catharines |
 | Law Society of Upper Canada | Toronto (City of) |
 | Law Society of Upper Canada, Law Society Referral Service | Toronto (City of) |
| | LEAP Low-Income Energy Assistance Program, Gas | Niagara Region |
| | LEAP Low-Income Energy Assistance Program, Hydro | Niagara Region |
 | Learning Disabilities Association of Niagara Region | St Catharines |
 | Learning From A to Z | Niagara Falls |
| | Learning Potentials, On-line programs and consulting for adult literacy | St Catharines |
| | Legal Aid Ontario, Client Service Centre | Ontario |
 | Legal Line | Toronto (City of) |
 | Legion Villa, Royal Canadian Legion Branch 393 Senior Citizens Complex | Smithville |
 | Lenscrafters, One Sight Program | St Catharines |
| | Les Filles D'Isabelle / Daughters of Isabella, St Catharines | St Catharines |
| | Lesbian Gay Bi Trans Youth Line | Toronto (City of) |
 | Leukemia and Lymphoma Society of Canada, Toronto Chapter | Toronto (City of) |
| | Leverage U | St Catharines |
| | Liberal Party of Canada, The, Niagara West - Glanbrook Electoral District Association | Grimsby |
| | Liberal Party of Canada, The, St Catharines Electoral District | St Catharines |
| | Liberal Party of Canada, The, Welland Federal Liberal Association | Welland |
| | Lice Squad Canada Inc, Niagara Regional Franchise | Niagara Falls |
 | Lidkea, Stob and Associates, Family Counselling Services | St Catharines |
| | Life is Always Good, Errand Services Niagara for Seniors | Niagara Falls |
 | Lifeline - Niagara Regional, Lifeline Personal Response System | St Catharines |
| | Lifestyle Meals | St Catharines |
 | Lighthouse Church of God | Niagara Falls |
 | Lighthouse Church, UPC | Welland |
 | Lighthouse Diner & The Clothing Depot, The | Ridgeway |
| | Lincoln and Welland Ambassadors, The Ambassadors | St Catharines |
| | Lincoln Association for Affordable Housing | Beamsville |
 | Lincoln Chamber of Commerce | Beamsville |
 | Lincoln County Humane Society | St Catharines |
 | Lincoln County Humane Society, Spay/Neuter Services | St Catharines |
 | Lincoln County Law Association | St Catharines |
| | Lincoln Leapers | Beamsville |
 | Lincoln Minor Hockey Association | Beamsville |
 | Lincoln Park Retirement Community | Grimsby |
 | Lincoln Public Libraries, Fleming Library | Beamsville |
 | Lincoln Public Libraries, Moses F Rittenhouse Library | Vineland |
 | Lincoln Public Libraries, Summer Programs 2013, Fleming Library | Beamsville |
 | Lincoln. Town Of | Beamsville |
| | Lincoln. Town Of, Arenas, Pools and Recreation Facilities | Lincoln |
 | Lincoln. Town Of, Community Services, Administration | Beamsville |
 | Lincoln. Town of, Community Services, Lincoln Centre, Beamsville Seniors | Beamsville |
 | Lincoln. Town Of, Municipal - Elected Officials | Beamsville |
 | Linda Martin Physiotherapy | St Catharines |
 | Link to Life Seminars Inc | Toronto (City of) |
 | Lioness Club, Chippawa | Niagara Falls |
| | Lioness Club, Dunnville | Dunnville |
 | Lioness Club, Fenwick | Fenwick |
 | Lioness Club, Grantham | St Catharines |
 | Lioness Club, Merritton | St Catharines |
| | Lioness Club, Port Colborne | Port Colborne |
| | Lioness Club, Port Dalhousie | St Catharines |
 | Lioness Club, St David's & District | Niagara-on-the-Lake |
 | Lioness Club, Stamford | Niagara Falls |
 | Lions Club, Beamsville & District | Beamsville |
 | Lions Club, Chippawa | Niagara Falls |
 | Lions Club, Fenwick | Fenwick |
| | Lions Club, Fonthill | Fonthill |
| | Lions Club, Fort Erie | Fort Erie |
| | Lions Club, Garden City | St Catharines |
 | Lions Club, Grantham | St Catharines |
 | Lions Club, Merritton | St Catharines |
 | Lions Club, Niagara Falls | Niagara Falls |
 | Lions Club, Port Colborne | Port Colborne |
 | Lions Club, Port Dalhousie | St Catharines |
 | Lions Club, Ridgeway | Ridgeway |
 | Lions Club, St Davids & District | St David's |
 | Lions Club, Stamford | Niagara Falls |
 | Lions Club, Wainfleet | Wainfleet |
 | Lions Douglas Heights Senior's Residence Inc | Fort Erie |
 | Literacy Link Niagara | Thorold |
 | Little Maestro Studio, Kindermusik | Thorold |
 | Little People of Ontario | Toronto |
 | Little Wedding Chapel on the Lane, The | Niagara Falls |
 | Living Waters Fellowship | Niagara Falls |
 | London Military Family Resource Centre, Hamilton/Cambridge Outreach Office | Hamilton Central |
 | Lookout Ridge Retirement Community | Fonthill |
| | Loving Outreach Suicide Support Group | St Catharines |
 | Loyalist Retirement Residence, The | St Catharines |
 | Lundy Manor Retirement Residence | Niagara Falls |
| | Lundy's Lane Historical Society | Niagara Falls |
 | Lundy's Lane United Church | Niagara Falls |
 | Lupus Foundation of Ontario | Ridgeway |
 | Luther Manor Apartments for Seniors | St Catharines |
 | Lutheran Homes Niagara | Niagara Falls |
 | Lymphedema Therapy, Education & Consulting, John Mulligan | St Catharines |
 | Lyndesfarne Theatre Projects, Niagara Falls Buskerfest 2012 | Niagara Falls |