ICS Mortgages is to increase its variable mortgage interest rates for owner occupiers, by between 0.2% and 0.3%, from 1 August.
The change brings the non-bank lender's variable rates to between 6.25% and 6.4% depending on the customer's loan-to-value ratio.
The lender is also set to raise its buy-to-let mortgage interest rates by between 0.3% and 0.5%.
That will bring the rate to between 7.2% and 7.25% depending on the type of loan.
ICS is the latest bank to increase its interest rates, following an announcement by Permanent TSB yesterday.
It said the change reflects the latest interest rate increases by the European Central Bank, and the ongoing rise in the cost of financing mortgage products.
"As a prudent and sustainable lender, ICS Mortgages remains committed to offering innovative mortgages and we will continue to review our position on interest rates on an ongoing basis," the lender said in a statement.
The ECB's main deposit rate now stands at 3.5% - a 22 year high.
It is expected to raise rates again at its meeting in late July, with a further increase in September also a possibility.
In April ICS Mortgages' parent company, Dilosk DAC, raised €500m in new funding as part of its plan to increase its share of the Irish mortgage market.
The funding was raised through the securitisation of Irish residential mortgages, made up entirely of Irish-owned, owner-occupier loans.
At the time it said ICS Mortgages had over €1.3 billion worth of mortgages under management.
