Vietcombank sold the dollar at VND25,499, down 0.03% from Tuesday. The greenback rose 0.08% to VND25,800 on the black market.
The State Bank of Vietnam reduced its reference rate by 0.03% to VND24,285.
The dollar has increased by 4.42% against the dong in the year to date.
Globally, the U.S. dollar slipped to a one-week low versus major peers on Wednesday, looking to extend a three-day decline from a one-week peak as the market catches its breath following the frantic rally in the wake of Donald Trump's election, Reuters reported.
The dollar index - which measures the currency against six major peers, including the yen and euro - fell to a low of 106.07 for the first time since Wednesday of last week, and stood at 106.18.
The index climbed to a one-year high of 107.07 on Thursday, buoyed by expectations for big fiscal spending, higher tariffs and tighter immigration under the incoming U.S. administration, measures which economists say could foster inflation and potentially slow Federal Reserve easing.
The dollar added 0.9% to 154.84 yen after falling sharply to 153.28 on Tuesday.
The euro held steady at $1.0598, having recovered from a drop to $1.0524 in the previous session.