Hon. Henry Ponsonby (1685 – 11 May 1745) was an Irish soldier.
He was the son of William Ponsonby, 1st Viscount Duncannon and brother of Brabazon Ponsonby, 1st Earl of Bessborough. He married his cousin Lady Frances Brabazon, daughter of Chambré Brabazon, 5th Earl of Meath, and was father of Chambré Brabazon Ponsonby.
- Dictionary of National Biography. London: Smith, Elder & Co. 1885–1900. .