Sars-le-Bois is a commune in the Pas-de-Calais department in the Nord-Pas-de-Calais region of France.
Sars-le-Bois lies on the banks of the river Canche, some 16 miles (25.7 km) west of Arras, on the D79E road.
Communes of the Pas-de-Calais department