The European Automobile Manufacturers' Association said that last month just 926,486 new cars were registered across the region - the market's first double-digit contraction in more than two years.
France's Renault and Peugeot Citroen led the drop, which was Europe's fourteenth consecutive monthly fall as economic uncertainty continued to spread.
The UK was the only significant car market to expand with a total of 149,191 car registrations, compared with 134,027 in November last year.
All other major car markets declined, with Germany's sales down 3.5% and registrations in both Italy and Spain falling by over 20%.
in Greece - where the eurozone debt crisis began in 2009 - there was a fall of 47.2%.
The figures come as shares in Fiat were suspended on the Italian stock exchange after its share price fell.
Il Messaggero said Fiat was hoping to raise between one and two billions euros (£810m-£1.62bn).
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