L
- (United Counties of Leeds and Grenville) Legge
- (United Counties of Leeds and Grenville) Lehighs Corners
- (Ottawa) Leitrim
- (Frontenac County) Leland
- (Ottawa) Lemieux Island
- (Lennox and Addington County) Lens
- (Ottawa) Leonard
- (Cochrane District) Lepage
- (Durham) Leskard
- (Ottawa) Leslie Park
- (Grey County) Letterbreen
- (Renfrew County) Letterkenny
- (Renfrew County) Letts Corners
- (Middlesex County) Lewis Corners
- (Middlesex County) Lieury
- (United Counties of Leeds and Grenville) Lillies
- (Grey County) Lily Oak
- (District Municipality of Muskoka) Limberlost Lodge
- (Hastings County) Lime Lake
- (Ottawa) Lincoln Heights
- (Ottawa) Lindenlea
- (Grey County) Lindenwood
- (Lennox and Addington County) Links Mills
- (York) Linton
- (Regional Municipality of Waterloo) Lisbon
- (Elgin County) Little Aylmer
- (United Counties of Leeds and Grenville) Little Brockville
- (Bruce County) Little Egypt
- (Northumberland County) Little Germany
- (Haliburton County) Little Hawk Lake