Sir John Coke (5 March 1563 – 8 September 1644) was an English civil servant and naval administrator, described by one commentator as "the Samuel Pepys of his day". He was MP for various constituencies in the House of Commons between 1621 and 1629, and served as Secretary of State under Charles I, playing a key part in government during the eleven years of Personal Rule from 1629 to 1640.