The leu closed at 4.444 per euro, from 4.4385 per euro in the previous session.
Elsewhere in the region, the Hungarian forint strengthened 0.4% against the euro, while the Polish zloty gained 0.5%.
The leu opened at 4.45 to the euro and moved in a tight band during the day. Market participants said investors showed increased appetite for the local currency in the second half of the trading session.
The central bank set the leu’s reference at 4.4455 versus the euro, 0.1% weaker on the day. Against the US dollar, the leu’s indicative was virtually flat at 3.319 units.
In the money market, overnight rates were at 1.6%-2.1% a year.