Seasonally adjusted data showed the economy increased 1.4% in the first quarter from the same period of 2012. In unadjusted data, the annual growth was 2.1%.
Detailed figures for the first-quarter GDP are due for release June 5.
Romania expects the economy will advance by 1.6% in 2013, after an increase of 0.7% a year earlier, helped by consumer spending and investment growth.