A book of condolences has been opened at Cork city hall as well as in Limerick to offer solidarity to the Orlando community following the massacre that left 49 dead and 50 injured.
A candle lit vigil is also being held in Limerick for the victims with Limerick Mayor saying they are offering their full support to the LGBT community.
The national flag will fly at half mast today as a mark of respect to those who died.
Flags will be lowered at Leinster House and all departmental buildings.