The 2011 Cooper Tires British Formula 3 International Series (an international motor racing series), was the 61st British Formula 3 International Series season. The season began on 16 April at Monza in Italy and ended on 9 October at Silverstone after 30 races held at ten meetings. Of those meetings, six were held in the United Kingdom, with overseas rounds at Monza, the Nürburgring in Germany, Paul Ricard in France, and Spa in Belgium.
Brazilian driver Felipe Nasr dominated the series, winning seven races and recording 16 top three finishes over the first eight rounds of the series, putting him 123 points ahead of Nasr's Carlin Motorsport teammate, Danish driver Kevin Magnussen, giving him an unassailable lead in the championship with two rounds still in hand.