John William Ponsonby, 4th Earl of Bessborough, PC, known as Viscount Duncannon from 1793 to 1844, was a British Whig politician. He was notably Home Secretary in 1834 and served as Lord Lieutenant of Ireland between 1846 and 1847, the first years of the Great Famine.
- Occupation
- politician
- Position held
- Home Secretary, Lord Lieutenant of Ireland, Member of the Privy Council of the United Kingdom, member of the 11th Parliament of the United Kingdom
- Citizenship
- United Kingdom of Great Britain and Ireland, Kingdom of Great Britain
- Born
