Sir Julian Stafford Corbett (12 November 1854 at Walcot House, Kennington Road, Lambeth – 21 September 1922 at Manor Farm, Stopham, Pulborough, Sussex) was a prominent British naval historian and geostrategist of the late 19th and early 20th centuries, whose works helped shape the Royal Navy's reforms of that era. One of his most famous works is Some Principles of Maritime Strategy, which remains a classic among students of naval warfare. Corbett was a good friend and ally of naval reformer Admiral John "Jacky" Fisher, the First Sea Lord. He was chosen to write the official history of British Naval operations during World War I.
The son of a London architect and property developer, Charles Joseph Corbett, who owned among other properties Imber Court at Weston Green, Thames Ditton, where he made the family home, Julian Corbett was educated at Marlborough College (1869–73) and at Trinity College, Cambridge (1873–6), where he took a first class honours degree in law. Corbett became a barrister at Middle Temple in 1877 and practised until 1882 when he turned to writing as a career. Fascinated by the Elizabethan period, he first wrote historical novels on this period. He became a correspondent for the Pall Mall Gazette, and reported on the Dongola Expedition in 1896. Corbett came to naval history in mid-life and from a civilian background. He was a man of independent means who traveled extensively.
Julian Corbett had three brothers, Herbert E. (1876–??), Edward M. (1899–??) and Frank E. (1881–??). In 1899 he Married Edith Alexander, daughter of George Alexander. They had one son and one daughter.
In 1896 Corbett accepted John Knox Laughton's request to edit a volume of documents on the Spanish war, 1585–87 which served as the start of his career as a naval historian. He soon became known as one of the Royal Navy's leading intellectuals, and from 1901 to 1922 was writing regularly on naval history and strategy. In 1902 he began lecturing at the Royal Naval College, founded in 1900. In 1903 he gave the Ford Lectures in English History at Oxford University. In 1905 he became the Admiralty's chief unofficial strategic adviser and served as secretary of the Cabinet Historical Office. Appointed a knight in 1917, he was awarded the Chesney Gold Medal in 1914.