The eurozone's retail sales volume fell 0.2% month over month in July following a 0.3% increase in June, Eurostat said.
The Econoday consensus was for sales to dip 0.1%.
Automotive fuel sales fell 0.7%, while food, drinks and tobacco sales dropped 0.6%. Sales of nonfood products ticked up 0.4%.
On an annual basis, the calendar-adjusted retail sales index rose 1.1% in July following an upwardly revised increase of 1.5% in June.