Operations on the Ancre took place from 11 January – 13 March 1917, between the British Fifth Army and the German 1st Army, on the Somme front during the First World War. After the Battle of the Ancre, British attacks on the Somme front stopped for the winter. Until early January 1917, both sides were reduced to surviving the rain, snow, fog, mud fields, waterlogged trenches and shell-holes. British preparations for the Battle of Arras, due in the spring of 1917, continued.

The Battle of the Ancre (13–18 November 1916), was fought by the British Fifth Army, against the German 1st Army. The Reserve Army had been renamed the Fifth Army on 30 October. The battle was the last of the big British attacks of the Battle of the Somme. After the Battle of Flers–Courcelette the Anglo-French armies tried to press their advantage with smaller attacks in quick succession, rather than pausing to regroup and give the Germans time to recover. Subsequent writers gave discrete dates for the Anglo-French battles but there were considerable overlaps and continuities of operations until the weather and supply difficulties in mid-November ended the battle until the new-year.