Admiral Sir Sydney Robert Fremantle, GCB MVO (16 November 1867 – 29 April 1958) was an officer of the Royal Navy, who served during the Victorian era and had risen to the rank of rear-admiral by the outbreak of the First World War. He played a role in developing fleet communications and signalling methods prior to the war, but was hampered in effectively implementing them due to the disruption caused by the conflict. He had an active seagoing career during the war, commanding several of the cruiser squadrons, and later taking command of the British fleet in the Aegean. Promoted to vice-admiral after the end of the war and given command of the First Battle Squadron, Fremantle oversaw the interned German High Seas Fleet at Scapa Flow, and was away on exercises when the sailors began to scutt