Bjarne Slot Christiansen (mostly known as B. S. Christiansen) (born September 27, 1952) is a former professional soldier from the Danish special force army unit Jægerkorpset, who is currently working with coaching and team building.

His many television appearances and a popular book called Et liv på kanten (A Life on the Edge) have made him a celebrity in his home country.

Christiansen is one of the few Danes who have completed the American Ranger course, he completed with his buddy Carsten Mørch who was "Distinguished Honor Graduate" Ranger School class '78.

[1] Among his most well known clients used to be the professional road bicycle racing team, Team Saxo Bank, for whom he organized a non-traditional training camp every year.

This Danish biographical article is a stub.