Ireland's two main banks borrowed over $11bn in emergency funding from the US Federal Reserve, according to data compiled by the Bloomberg news agency.
Allied Irish Bank borrowed $9.4bn while Bank of Ireland borrowed $2.1bn.
The money was lent out in 2009 and 2010 as the US authorities attempted to avert a financial meltdown.
The figures are contained in documents obtained under the US Freedom of Information act.
They show that the Federal Reserve provided $1.2tn to US and European banks over the period, amid concerns that inter-bank lending was drying up.
