Henry Stanley Monck, 1st Earl of Rathdowne and 2nd Viscount Monck (26 July 1785 – 20 September 1848), was the son of Charles Monck, 1st Viscount Monck, and Anne Quin. On 28 July 1806, he married Lady Frances Mary Trench, daughter of William Trench, 1st Earl of Clancarty, and his wife Anne, Countess of Clancarty ("née" Gardiner). They had 11 daughters.
As he died without male heirs, the earldom became extinct and the viscountcy was inherited by his brother Charles.