Vietcombank sold the dollar at VND25,458, down 0.07% from the previous day.
The greenback was stable at VND25,700 on the black market.
The State Bank of Vietnam (SBV) kept its reference rate steady at VND24,246.
It has increased against the dong by 4.25% since the beginning of the year.
Globally, the yen hit its weakest level in three decades against the U.S. dollar after the Bank of Japan left interest rates on hold on Friday, leaving traders on edge about the risk of official intervention, Reuters reported.
The yen was 0.3% weaker at 156.21 per dollar in the Asian afternoon, its weakest since 1990. The euro were steady, holding gains made on Thursday when data showed the U.S. had grown at its slowest pace in nearly two years.
The euro was last at $1.0725. The dollar index was steady at 105.7 even as the 10-year Treasury yield rose above 4.70% for the first since November after a US inflation reading cemented bets that the Federal Reserve will not rush to cut interest rates.