John Ketch (died November 1686), generally known as Jack Ketch, was an infamous English executioner employed by King Charles II. He became famous through the way he performed his duties during the tumults of the 1680s, when he was often mentioned in broadsheet accounts that circulated throughout the Kingdom of England. He is thought to have been appointed in 1663. He executed the death sentences against William Russell, Lord Russell, in Lincoln's Inn Fields on 21 July 1683, and James Scott, 1st Duke of Monmouth, on 15 July 1685, after the Monmouth Rebellion. Ketch's notoriety stems from "barbarity at the execution of Lord Russell, the Duke of Monmouth, and other political offenders".