John Jenyns (c. 1660 – 1717), of Hayes and Bedford Row, St Andrew Holborn, Middlesex, was an English politician.^[1]

He was the eldest son of Roger Jenyns of Hayes. He succeeded his father to the manor of Hayes and to the surveyor generalship of the Fens, a post he then held for 20 years.

He was a Member (MP) of the Parliament of Great Britain for Cambridgeshire 1710 – 1 February 1717.

He married Jane, the daughter of James Clitherow of Boston House and had three sons.