Germany's DAX index fell 34.98 points, or 0.86%, to 4,026.15. In Paris, the CAC 40 index lost 30.28 points, or 0.8%, to 3,743.15.
Asian markets finished lower on Wednesday. In Japan, the Nikkei 225 index declined 7.96 points, or 0.07%, to close at 11,944.3, as tech names slid after Tuesday's strong performance and amid cautious sentiment ahead of Greenspan's congressional testimony later Wednesday. Analysts say a U.S. interest rate hike could lead to selling of U.S. stocks, which would encourage foreign investors to take profits on Japanese stocks as well.
In Hong Kong, the Hang Seng index lost 167.07 points, or 1.35%, to close at 12,227.3.
Canada's benchmark S&P/TSX fell 29.93 points, or 0.35%, to 8,573.05.