Sir George Barnes Peacock (1805 – 3 December 1890) was an English judge who served as the first Chief Justice of the Calcutta High Court in India and the final Chief Justice of the Supreme Court of Judicature at Fort William. In 1859, Peacock became the last Chief Justice of the Supreme Court of Judicature at Fort William, and was knighted. He was appointed the first Chief Justice of the Calcutta High Court on 1 July 1862. He returned to England in 1870 and in 1872 was appointed a paid member of the Judicial Committee of the Privy Council, the court of last resort for the British Empire.