- Laban
- Lackagh
- Laghtgannon
- Laghtgeorge
- Laghtyslaughnessy
- Laragh Beg
- Laragh More
- Lator’s Cross Roads
- Laughil
- Laurencetown
- Leagaun
- Leagaun
- Lecarrow
- Leenaun
- Lehinch
- Leighon Island
- Leitrim
- Letter More
- Lettera
- Letteragh
- Lettercallow
- Letterfrack
- Lettergunnet
- Lettermore
- Lettermore Island
- Lettermullan
- Liscananaun
- Lisconly
- Liscune
- Lisduff