The greenback fell 0.12% from Tuesday to VND25,810 at unofficial exchange points. It held firm at VND25,509 at Vietcombank.
The State Bank of Vietnam kept its reference rate unchanged at VND24,295.
Since the beginning of the year, the dollar has risen against the dong by 4.46%.
Globally, the U.S. dollar steadied against major peers on Wednesday as investors continued to take stock of President-elect Donald Trump's tariff pledges, while keeping an eye on a key inflation figure out of the U.S. later in the day, Reuters reported.
The dollar index, which measures the greenback against six rivals, was last down 0.07% at 106.83.
The yen, meanwhile, held onto gains made from safe-haven bids amid the turmoil. The dollar was last down 0.19% at a two-week low of 152.81 yen.
The euro was little changed at $1.0493, while sterling last fetched $1.25735, up 0.05%.