Brøndby IF is a Danish professional football club based in the town of Brøndby, on the western outskirts of Copenhagen. The club is also known as Brøndbyernes Idrætsforening, or Brøndby and BIF for short. The club, founded in 1964 as a merger between two local Brøndby clubs, has won 10 national Danish football championship titles and five national Danish Cups, since the club joined the Danish top-flight football league in 1981
Since the founding of fellow Copenhagen club F.C. Copenhagen in 1992, the two clubs have had a fierce rivalry, and the so-called "New Firm" games between the two sides attract the biggest crowds in Danish football. With F.C. Copenhagen, Brøndby has consistently formed a duo which have won eleven of the last sixteen Danish Superliga championships. From 1985 to the season 2007/08, Brøndby IF won a medal every year, except from 1992, 2007 and 2008, and from 1995 to 2006, the club did not finish below second spot in the league. Brøndby IF are currently taking part in the Danish Superliga 2008-09 tournament.