The regulator says the bank failed to put proper systems in place to protect its services from significant IT outages for 11 years.
This €24.5 million fine was issued to Bank of Ireland by the Central Bank on Tuesday, but its details have just been released.
The fine relates to the banks failure to have a proper contingency system in place for customers, in the event of a serious IT disruption to its services.
The Central Bank says deficiencies were repeatedly identified from 2008 onwards, but steps to address them only began in 2015, and it was 2019 before they were complete.
The bank has admitted five breaches in total.
It was initially ordered to pay €35 million, but that was reduced by 30% under a settlement discount scheme.
New Operator at Wicklow Gaol Brings A Reopening Date Closer
Investigations Continue Into Armed Chase and Crash in Kilcoole
Former US Marine Jailed After Grooming and Abusing Wicklow Teen
Wicklow Property Prices Rise by €7,500 In One Year
Peter Thiel Event Will Not Go Ahead In Wicklow Hotel