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 died before he inherited the earldom and thus was never Countess of Bessborough, but three of her sons were successively earls of Bessborough.