The Second Battle of the Somme of 1918 was fought during the First World War on the Western Front from late August to early September, in the basin of the River Somme. It was part of a series of successful counter-offensives in response to the German Spring Offensive, after a pause for redeployment and supply.

The most significant feature of the two 1918 Somme battles was that with the failure of the first 1918 Somme Battle (not be the confused with the earlier, 1916 Battle of the Somme) having halted what had begun as a large German offensive, the second formed the central part of the Allies' advance to the Armistice of 11 November.