Sir John Duncombe (1622 – 4 March 1687) was an English politician who sat in the House of Commons from 1660 to 1679.
Duncombe was the son of William Duncombe of Battlesden and his wife Elizabeth Poyntz, daughter of Sir John Poyntz of South Ockendon, Essex and was baptised on 29 July 1622.
In 1660, Duncombe was elected Member of Parliament for Bury St Edmunds in the Convention Parliament.
He was re-elected MP for Bury St Edmunds in 1661 for the Cavalier Parliament.
This article about a 17th-century member of the parliament of England (up to 1707) is a stub.