The ground were Flatiron Copse Cemetery is situated was taken by the 3rd and 7th Divisions on 14 July 1916, and an Advanced Dressing Station was established at the Copse. 

The cemetery was begun about 20 July 1916 and it remained in use until April 1917.  After the Armistice 1,149 graves were brought in from smaller cemeteries and from neighbouring battlefields.  Almost all the concentrated graves are those of men who fell in the summer and autumn of 1916. 

Within Flatiron Copse Cemetery special memorials record the names of nine soldiers from the United Kingdom buried in Mametz Wood Cemetery whose graves were subsequently destroyed by shellfire.

Flatiron Copse Cemetery is located 2km northeast of the village of Mametz, east of the Bois de Mametz in the Vallée Wagnon.