Fuel sales declined 3.3% in April from the previous month, while sales of non-food items nudged down 0.6% on the month in data adjusted for the number of working days and seasonal factors.
Sales of food, drinks and tobacco were flat on the month, the data showed.
In annual terms, adjusted retail sales fell 6.2% in April, due to declines in all sectors.
Sales of food, drinks and tobacco were down 8.3% in April from the same month a year earlier, while fuel sales decreased by 4.2%. Sales of non-food items nudged down 0.1% on the year in April.
In the January to April period, Romanian adjusted retail sales declined 5.9% on the year, again due to lower sales in all sectors, INS data showed.