Hartmannswillerkopf, also known as the Vieil Armand (French) or Hartmannsweiler Kopf (German; English: Hartmansweiler Head) is a pyramidal rocky spur in the Vosges mountains of the Grand Est region, France.

At Hartmannswillerkopf stands a national monument of World War I for the fighting which took place in the trenches here.

[1] After about 11 months of fierce combat, both sides began to focus most of their attention farther north on the Western Front.

The lines remained relatively stable for the remainder of the war and generally only artillery exchanges took place.

On 3 August 2014, French President Francois Hollande and German President Joachim Gauck together marked the centenary of Germany's declaration of war on France by laying the first stone of a memorial at Hartmannswillerkopf, for French and German soldiers killed in this area during the war.