L
- (Sligo) Lislary
- (County Galway) Lisheenavalla
- (County Galway) Lisheen
- (County Galway) Lisduff
- (County Galway) Lisconly
- (Mayo County) Liscarney
- (County Galway) Liscananaun
- (Roscommon) Lisacul
- (County Galway) Lettermore Island
- (County Galway) Lettera
- (Sligo) Lenstown
- (County Galway) Leitrim
- (County Galway) Leenaun
- (County Leitrim) Lecarrow
- (Roscommon) Lecarrow
- (County Galway) Laurencetown
- (County Leitrim) Larkfield
- (County Leitrim) Largydonnell
- (County Galway) Laghtgeorge
- (County Galway) Laban
- (County Galway) Lettermullan
- (Mayo County) Leckanvy
- (Mayo County) Lislaughna
- (Roscommon) Largan
- (Sligo) Liskeagh
- (Sligo) Leyny
- (Sligo) Lavagh
- (Sligo) Largan
- (Sligo) Largan
- (Sligo) Lecarrow