Ballyhaunis, Charlestown and Kiltimagh are the branches of Bank of Ireland set to close in Mayo.
While in county Galway the branches to close are Ballygar, Dunmore and Oughterard.
In Roscommon, Elphin and Strokestown branches are to close.
Whille the branches in Ballymote and Tubbercurry are to close in Sligo.
In total, Bank of Ireland is closing 88 branches in the Republic, and 15 in Northern Ireland.
The branches, due to close by the end of September, are described by the bank as "mainly self-service which don't have a counter service".
It says they all have a post office within 500 metres on average.
The bank is entering into a new partnership with An Post to offer banking services at over 900 locations, with longer opening hours.