Vietcombank sold the greenback at VND25,563, up 0.01% from Monday.
The State Bank of Vietnam hiked its reference rate by 0.01% to VND24,346.
The dollar was sold at VND25,750 on the black market, down 0.19%. It has risen 0.05% against the dong since the beginning of this month.
Globally the dollar hung near its highest in more than two years on Tuesday as traders scale back U.S. rate cuts in 2025 after strong economic data, while investor worries about Britain's fiscal health kept frail sterling in the spotlight, Reuters reported.
With President-elect Donald Trump set to step back into the White House next week, the focus has been on his policies that analysts expect will boost growth but add to price pressures.
The dollar index, which measures the U.S. currency versus six other units, was 0.16% higher at 109.59, not far from the 26-month high of 110.17 it touched on Monday.