The Irish Bank Officials Association has decided hold a strike ballot among Bank of Ireland staff over the introduction of a new pension scheme.
The bank is due to bring in the scheme on Monday for all new employees.
The IBOA claims it will introduce a two-tier pension system and leave new staff members in a worse position than current workers.
It says it has no choice but to hold a vote on strike action due to the bank's refusal to defer the introduction of the new scheme pending negotiations at the Labour Court.