William Jolliffe, 4th Baron Hylton

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 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 Raymond Asquith, eldest son of Prime Minister H. H. Asquith, in 1931. He died in November 1967, aged 68, and was succeeded in his titles by his son Raymond.

The writer John Hedworth Jolliffe is his younger son; the actress Anna Chancellor is a granddaughter.