Kjøbenhavns Boldklub or KB is a Danish sports club based in Copenhagen. The club was founded 26 April 1876 on the grassy fields in outer Copenhagen which later became Fælledparken. Football and cricket has been played in KB since 1879, making KB one of the oldest football clubs on Continental Europe and the oldest general sports club on the continent (with more than just one sport). Tennis has been played since 1883. The club hosted, in 1921, one of the early tennis majors: the World Covered Court Championships, won by William Laurentz that year. Today, along with the sports already mentioned, the club also has facilities for badminton, swimming and pétanque.
The football team went on to become the most successful club in Denmark, winning a record 15 Danish championship titles from 1913 to 1980. In 1991, KB and B 1903 merged their professional football teams and formed F.C. Copenhagen. Until 1 January 2009, the F.C. Copenhagen reserves played under the KB name.
KB's logo is designed by architect and designer Thorvald Bindesbøl (1846–1908). Bindesbøl also designed the Carlsberg logo, and KB's logo is believed to be sponsored by Carlsberg.