Edward Ponsonby, 8th Earl of Bessborough, KP, CB, CVO (1 March 1851 – 1 December 1920), known as Viscount Duncannon from 1895 until 1906, was a British peer.

He also took the courtesy title of Viscount Duncannon following his father's accession to the earldom of Bessborough, also in that year.

He was also involved in business and became a director of the London, Brighton and South Coast Railway in March 1895, and served as its chairman from February 1908 until his death.

On 22 April 1875, Ponsonby married Blanche Guest (1847–1919), the sister of Ivor Guest, 1st Baron Wimborne, and they had six children: Ponsonby inherited the earldom from his father in 1906, and on his death in 1920, his titles passed to his eldest son, Vere.

His death procured an erroneous obituary of Lord Desborough being published after The Times confused the two peers.