Maria Ponsonby, Viscountess Duncannon (née Lady Maria Fane; 11 May 1787 – 19 March 1834) was an English aristocrat and the wife of John Ponsonby, Viscount Duncannon (later 4th Earl of Bessborough).
She was the daughter of John Fane, 10th Earl of Westmorland, and his first wife, the former Sarah Anne Child.
She married Ponsonby on 16 November 1805 at Berkeley Square, London, when he was known as Viscount Duncannon.
[1] They had eight sons and six daughters, including:[2] After several months of illness, Lady Duncannon died in 1834, aged 46, at her home in Cavendish Square, London.
She died the day after her daughter Lady Augusta's wedding to the Earl of Kerry.