M
- (Limerick City and County Council) Mountcollins
- (County Waterford) Mount Bolton
- (County Waterford) Mothel
- (County Cork) Monkstown
- (Kerry) Moneyduff
- (Kerry) Moneycashen
- (County Cork) Monavarnoge
- (Limerick City and County Council) Monaster
- (County Cork) Monanveel
- (Kerry) Molahiffe
- (County Tipperary) Modreeny
- (County Waterford) Modelligo
- (County Tipperary) Mocklershill
- (County Cork) Minane Bridge
- (Kerry) Milltown
- (County Cork) Millstreet
- (County Tipperary) Milestone
- (County Cork) Meelin
- (Limerick City and County Council) Meanus
- (Clare) Mauricemills
- (Kerry) Maulyneill
- (County Cork) Maugha
- (Clare) Mattle Island
- (Kerry) Mastergeehy
- (County Cork) Massytown
- (County Tipperary) Mary Ville
- (Clare) Mary Fort
- (County Tipperary) Manseltown
- (County Cork) Manning
- (Limerick City and County Council) Mahoonagh