Morrell was the son of Frederic Morrell, a solicitor of Black Hall, Oxford, by his wife Harriette Anne, daughter of the President of St John's College, Oxford and Vice-Chancellor of the University of Oxford, the Rev. Philip Wynter DD. The Morrell family had made its fortune as brewers of beer, and Philip Morrell's grandfather was a trustee of the family brewery. He was educated at Eton and Balliol College, Oxford.
He was adopted as the Liberal candidate for Henley in September 1902, on the advice of H. H. Asquith, and was elected as such in the following election in 1906. He served in that constituency to 1910 and in Burnley from 1910 to 1918. He was the only non-Conservative MP for Henley.
Morrell married in London on 8 February 1902 Lady Ottoline Cavendish-Bentinck, half-sister of the 6th Duke of Portland. Lady Ottoline became an influential society hostess. They shared what would now be known as an open marriage for the rest of their lives.
His extramarital affairs produced several children who were cared for by his wife, who also struggled to conceal evidence of his mental instability. The Morrells themselves had two children (twins): a son, Hugh, who died in infancy; and a daughter, Julian Morrell (1906–1983), whose first marriage was to Victor Goodman and second marriage was to Igor Vinogradoff.
- National Probate Calendar (1943): MORRELL Philip Edward
- "Election intelligence". The Times (36876). London. 18 September 1902. p. 5.
- "Court circular". The Times (36687). London. 10 February 1902. p. 6.
- Rolphe, Katie. Uncommon Arrangements: Seven Marriages Random House Digital, Inc.: New York, 2008
- "Julian Ottoline Vinogradoff (née Morrell) (1906-1989), Daughter of Lady Ottoline Morrell; married firstly Victor Goodman (by whom she had three children),and secondly Igor Vinogradoff". Npg.org.uk. Retrieved 20 January 2013.
- Hansard 1803–2005: contributions in Parliament by Philip Morrell
|Parliament of the United Kingdom|
| Member of Parliament for Henley
1906 – January 1910
| Member of Parliament for Burnley
December 1910 – 1918
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