Euro zone gross domestic product (GDP) rose by 0.2 percent in the July-September period, Eurostat reported, confirming its earlier preliminary estimates.
This was the slowest rate of economic growth since the second quarter of 2014 and a marked slowdown from 0.4 percent growth in the second quarter.
On the year, the GDP growth rate in the 19-country currency bloc was 1.6 percent, Eurostat said, revising down its earlier estimate of a 1.7 percent expansion.
The economy of Germany, the euro zone's largest, contracted by 0.2 percent on the quarter, France's was 0.4 percent stronger, while Italy's GDP shrunk by 0.1 percent.
In a separate release on Friday, Eurostat confirmed its previous estimates on employment growth in the euro zone.
The number of people employed in the euro zone increased by 0.2 percent quarter-on-quarter and by 1.3 percent year-on-year, compared with rates of 0.4 and 1.5 percent respectively in the second quarter.
(Reporting by Francesco Guarascio)