Sophia Dorothea of Hanover (26 March [O.S. 16 March] 1687 – 28 June 1757) was Queen in Prussia and Electress of Brandenburg during the reign of her husband, King Frederick William I, from 25 February 1713 to 31 May 1740. She was the daughter of King George I of Great Britain and his wife Sophia Dorothea of Celle, the sister of King George II of Great Britain, and the mother of Frederick the Great (King Frederick II of Prussia).