Molliens-au-Bois (French pronunciation: [mɔljɛ̃ o bwa]) is a commune in the Somme department in Hauts-de-France in northern France.

During the Battle of Amiens in August 1918, the divisional HQ of the U.S 33rd Infantry Division was set up in the chateau at Molliens-au-Bois.

On the night of August 8–9, 1918, as three Battalions of Doughboys from the 33rd U.S. Division were joining the Allied offensive during the Battle of Amiens, American war poet Lieut.

Thomas J. Cochrane were assigned to deliver sealed orders from Division HQ at Molliens-au-Bois to the Field Headquarters of all three Battalions engaged in the attack.

The location of each Battalion was unknown, but they were believed to be along the northern bank of the Somme River, near the village of Sailly-le-Sec.