| Honorific-Prefix: | The Right Honourable |
| The Lord Hylton | |
| Office4: | Member of the House of Lords Lord Temporal |
| Term Start4: | 26 May 1945 |
| Term End4: | 14 November 1967 Hereditary Peerage |
| Predecessor4: | The 3rd Lord Hylton |
| Successor4: | The 5th Lord Hylton |
| Birth Date: | 2 December 1898 |
| Death Date: | 14 November 1967 (aged 68) |
| Nationality: | British |
William George Hervey Jolliffe, 4th Baron Hylton (2 December 1898 – 14 November 1967), was a British peer and soldier.
Hylton was the son of Hylton Jolliffe, 3rd Baron Hylton, and Lady Alice Adeliza Hervey. He achieved the rank of Lieutenant-Colonel[1] in the Coldstream Guards and also served as Lord Lieutenant of Somerset from 1949 to 1964. Lord Hylton married Lady Perdita Rose Mary Asquith, daughter of Katharine and Raymond Asquith, eldest son of Prime Minister H. H. Asquith, in 1931.[2] He died in November 1967, aged 68.
He was succeeded in his titles by his elder son Raymond. John Hedworth Jolliffe, a writer (of e.g. Raymond Asquith: Life and Letters)[3] is his younger son; his daughter Mary is the wife of John Paget Chancellor, son of Christopher Chancellor of Reuters. Mary and John Chancellor are the parents of the actress Anna Chancellor and the financial historian Edward Chancellor.[4]