"Benbow" served in the Grand Fleet as the flagship of the 4th Battle Squadron during the war. She was present during the largest naval action of the war, the Battle of Jutland on 31 May – 1 June 1916, though she was not heavily engaged. She sortied twice more, in August 1916 and April 1918 in attempts to catch the German High Seas Fleet in another major battle, but neither produced any significant action. After the end of the war in 1918, "Benbow" and the rest of the 4th Squadron were reassigned to the Mediterranean Fleet. There, she took part in operations in the Black Sea in support of White Russians in the Russian Civil War until mid-1920, when the Mediterranean Fleet began supporting Greek forces during the Greco-Turkish War. In 1926, "Benbow" was reassigned to the Atlantic Fleet. She was decommissioned in 1929, placed on the sale list in September 1930, and sold for scrap the following year.