as simply BK, is a private day school, gymnasium, and boarding school situated in Bagsværd, a suburb of Copenhagen.

The vast majority of the 800 pupils and students at BK commute to school every day; the boarding school (Haraldsgave, lit.

"Harald's Gift", commonly known as Haga) only houses up to 60 students.

The boarding school was established in 1908 on the site of the current day school, in the then rather rural area surrounding Bagsværd Sø; it was only later that this part of Northern Zealand was urbanized.

The boarding school itself, located right next to Bagsværd Lake, was acquired in 1949 and has since been expanded, both through the construction of new buildings and the appropriation of neighbouring lots.