| Honorific Prefix: | The Right Honourable |
| Sir Henry Williams-Wynn | |
| Honorific Suffix: | KCB GCH |
| Office: | British Envoy to Denmark |
| Term Start: | 1824 |
| Term End: | 1853 |
| Predecessor: | Augustus John Foster |
| Successor: | The Earl of Sheffield |
| Office1: | Member of Parliament for Midhurst |
| Term Start1: | January 1807 |
| Term End1: | May 1807 |
| Predecessor1: | John Smith William Wickham |
| Alongside1: | William Conyngham Plunket |
| Successor1: | Samuel Smith James Abercromby |
| Birth Name: | Henry Watkin Williams-Wynn |
| Parents: | Sir Watkin Williams-Wynn, 4th Baronet Charlotte Grenville |
| Children: | 6 |
| Relatives: | George Grenville (grandfather) |
Sir Henry Watkin Williams-Wynn KCB GCH (16 March 1783 – 28 March 1856) was a British MP in the early 19th century. From 1824 to 1853, he served as the British Envoy to Denmark.
He was the younger son of eight children, six of whom survived to adulthood, of Sir Watkin Williams-Wynn, 4th Baronet, and, his second wife, Charlotte Grenville. Among his siblings was elder brothers Sir Watkin Williams-Wynn, 5th Baronet (who married Lady Henrietta Clive, a daughter of Edward Clive, 1st Earl of Powis) and Charles Williams-Wynn, Secretary at War and Chancellor of the Duchy of Lancaster (who married Mary Cunliffe, daughter of Sir Foster Cunliffe, 3rd Baronet). His sister Henrietta Elizabeth Williams-Wynn, married Thomas Cholmondeley, 1st Baron Delamere.
His father was the only son of Sir Watkin Williams-Wynn, 3rd Baronet and his second wife, Frances Shackerley of Cheshire, and succeeded to the baronetcy (and extensive Wynnstay estates, the largest in North Wales) when only a baby after his father was killed by a fall from his horse while hunting. His maternal grandparents were Elizabeth (née Wyndham) Grenville (daughter of the Tory statesman Sir William Wyndham, 3rd Baronet) and Prime Minister George Grenville.
Williams-Wynn sat for Midhurst from January to May 1807.[1] From 1824 to 1853, he served as the British Envoy to Denmark.
He was appointed Knight Commander, Order of the Bath and was appointed Knight Grand Cross, Hanoverian Order.
On 30 September 1813, he married Hon. Hester Frances Smith, daughter of Robert Smith, 1st Baron Carrington of Upton and the former Anne Boldero-Barnard. Together, they were the parents of:[2]
Williams-Wynn died on 28 March 1856.[5]
Through his eldest daughter Charlotte, he was a grandfather of four, including Countess Helene von Bismarck-Schierstein (1850–1903) (who married Maj. Wilfred Joseph Cripps), and Count Otto Franz Karl von Bismarck-Schierstein (1854–1910).[6]