Fisher was born in Croydon, London, the only son of Henry Warren Fisher. He was educated at the Dragon School (Oxford), Winchester College and Hertford College, Oxford. He matriculated in 1898, taking a first Classical Moderations in 1900 and a graduating with a second in Greats in 1902.
After failing to get into the Indian Civil Service and the medical examination for the Royal Navy, he came a lowly 15th in the Inland Revenue entrance exams in 1903. Sixteen years later he was Permanent Secretary to the Treasury and the first-ever Head of the Home Civil Service. Fisher has been described as one of the most influential British civil servants of his generation 
Fisher gave the Civil Service a cohesion it previously lacked and did more to reform it than any man in the preceding fifty years. He increased the importance of the Treasury. He advanced the interests of women in the civil service and at one point described himself as a feminist. However, he was also a controversial figure: his colleague Maurice Hankey, with whom he sometimes co-operated and sometimes competed on issues of imperial defence policy, once described him as 'rather mad', and he was criticised for his attempts to control the appointments of senior civil servants across Whitehall. Christopher Bullock was one example. His generally unsuccessful attempts to gain a say in Foreign Office appointments were much resented, and gave rise to unfounded accusations that he had been an appeaser (despite a robust defence of his reputation by the arch-antiappeaser Robert Vansittart).
He married Mary Ann Lucie (Maysie) Thomas on 24 April 1906 and had two sons, but the marriage ended in separation in 1921. He died in London a few days after his 69th birthday.
Sir Noel Curtis-Bennett eulogised him in a letter to The Times:
|“||Thousands of lower grade Civil servants owe to him more than they will ever know. He possessed a burning patriotism, not only for his country but for the great Service over which he presided for 20 years...In his passing the nation loses not only a great and distinguished public servant, but a very simple and true English gentleman who loved his fellow-men and was not afraid to show it. He had complete and utter faith. To those of us who really knew him and loved him his death leaves a blank in our lives which can never be filled.||”|
|— Sir Noel Curtis-Bennett, The Times, 8 October 1948|
His elder son Norman Fisher (d. 1982) made his career in the Royal Navy, surviving two submarine disasters before the war and attaining the rank of captain; his second son Robin died in 1988.
| Head of the Home Civil Service
Sir Horace Wilson
Sir John Bradbury
Sir Robert Chalmers
| Permanent Secretary to the Treasury
Sir Horace Wilson
- Fisher, Sir (Norman Fenwick) Warren at Oxford Dictionary of National Biography (requires login)
- Hennessy, Peter, Never Again (London: Penguin Books 1992)
- O'Halpin, Eunan, Head of the Civil Service: A Study of Sir Warren Fisher, (London: Routledge 1989)
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