Compared with October 2014, the rate increased 0.1 percentage points.
An estimated 630,000 people were jobless in Romania in October, from 634,000 in September.
Unemployment among women stood at 5.7%, while unemployment among men stood at 7.6% in October, the data showed.
The figures refer to people aged between 15 and 74 and are based on the definition recommended by the International Labor Organization.