John Jeffreys (c.1623-1689) was a Welsh soldier, landowner and politician, much of whose career was spent in Ireland. He fought in the English Civil War on the Royalist side, and later sat in the Houses of Commons of both England and Ireland. He is best remembered as the first Master of the Royal Hospital Kilmainham.
- Occupation
- politician
- Position held
- Member of Parliament in the Parliament of England, Member of Parliament in the Parliament of Ireland, Member of the 1680-81 Parliament, Member of the 1681 Parliament
- Citizenship
- Kingdom of England, Kingdom of Ireland
- Died
- 1689
