Sir William Evans Ryves de Montmorency, 3rd Baronet (7 November 1763 – 14 April 1829) was an Anglo-Irish politician.
[1] Born William Morres, he was the son of Sir William Morres, 1st Baronet and Mary Juliana Ryves, and the half-brother of Sir Haydock Morres, 2nd Baronet.
On 11 October 1774 he succeeded to his half-brother's baronetcy.
Between 1785 and 1790 he was the Member of Parliament for Newtownards in the Irish House of Commons.
[2] On 17 June 1815 he legally changed his surname to de Montmorency by Royal Licence, as did his relation Lodge de Montmorency, 1st Viscount Frankfort de Montmorency and three other cousins.