The weighted repo rate was 6.0%, down from the 6.40% achieved at the auction held on October 1, the central bank said in a statement.
At Thursday's auction the repo rate of bids ranged from 5.05% to 7.0%.
The marginal rate for all accepted bids was 5.05%, up from 5.0% a week ago.
At the reverse repo auction on October 1, the Croatian central bank approved all bids for Treasury bills worth some 1.963 billion kuna.
The Croatian central bank launched open market operations in April 2005 using T-bills as collateral and aiming to manage liquidity better and prevent sharp interest rate fluctuations.
(1 euro = 7.1403 Croatian kuna)