Sir John Knight (24 November 1613 – 16 December 1683) was an English merchant and politician who sat in the House of Commons from 1660 to 1681.
He inherited his father's business in Temple Street, and became one of the most prosperous merchants in the city, and a prominent High Church member of the common council.
Moderates were scandalised by the mayor's rushing out of church for his Sunday recreation of hunting down Quakers, Nonconformists and Catholics.
His intolerance increased over time and in 1669 he denounced the other members of the common council, including his namesake, John Knight who was mayor of Bristol in the following year, as fanatics.
In August 1680 he acted as emissary from William Bedloe, the false witness of the Popish Plot to Chief Justice North.