Joseph Windham-Ashe (1683–30 July 1746) of Twickenham, Middlesex, was an English merchant and politician who sat in the House of Commons between 1734 and 1746.
He was related on his father’s side to the Windhams of Norfolk and through his mother and wife to the Ashes of Heytesbury.
Windham-Ashe was returned unopposed as Member of Parliament for Downton as a government supporter at the 1734 British general election.
Windham-Ashe was put into custody of the serjeant at arms on 18 January 1743 for defaulting on a call of the House.
Windham-Ashe died on 30 July 1746 leaving one daughter Mary, who married John Windham-Bowyer in September 1734.