After the outbreak of the First World War in August 1914, "Queen", still part of the 5th Battle Squadron, initially served in the English Channel. After operations with the Dover Patrol, she served in the Dardanelles Campaign in support of the Allied landings at Gallipoli. She participated in the Landing at Cape Helles on 25–26 April and supported ANZAC forces ashore over the course of the following month. In late May 1915, "Queen" was withdrawn to reinforce the Italian fleet at the southern end of the Adriatic Sea after Italy joined the war on the side of the Allies. In early 1917, she was converted into a depot ship to support the Otranto Barrage and was disarmed over the course of the year. The ship returned to Britain after the war in early 1919, where she was briefly used as a barracks ship. "Queen" was sold for scrap in 1920 and was broken up the following year.