Admiral of the Fleet Sir George Astley Callaghan (21 December 1852 – 23 November 1920) was an officer in the Royal Navy. During the Boxer Rebellion he served as commander of a naval brigade sent ashore to form an element of a larger expedition under Lieutenant-General Sir Alfred Gaselee: the expedition entered Peking and rescued the legations which had been held hostage there. He came to prominence again when, as Second-in-Command of the Mediterranean Fleet, he assisted with the provision of aid to survivors of the Messina earthquake, which had caused the loss of circa 123,000 lives.