Boldklubben 1903 or B 1903 is a football club founded on 2 June 1903, located in Copenhagen, Denmark.

Best international result: Quarter final in the 1991–92 UEFA Cup after eliminating Aberdeen F.C., Bayern Munich (6–2 and 0–1) and Trabzonspor.

Copenhagen to which Boldklubben 1903 transferred its license to play in the Danish league.

Copenhagen won the Danish championship in its first season.

This article about a Danish football club is a stub.