The data from the Central Bank shows that the weighted average interest rate for Irish mortgages stood at 2.98% in February - unchanged from the January level.
This compares to the euro zone average of 3.86%.
The gap is because of the higher proportion of Irish homeowners who have tracker mortgages.
These have become cheaper as the ECB has cut interest rates to record lows of 1%.
Today's Central Bank figures also reveal that interest rates on outstanding loans to households here continues to fall with the weighted average on all outstanding loans easing to 6.09% from 6.12% at the end of January.
On deposits, the Central Bank said that interest rates on household term deposits rose significantly over the past year, reflecting efforts by banks to secure additional funding by offering more attractive rates on longer-term deposit products.
The weighted average interest rate on all term deposits has risen from 2.78% at the end of 2010 to 3.46% by the end of February. The average euro zone rate is 2.79%.