| Honorific-Prefix: | The Right Honourable |
| The Viscount Astor | |
| Office: | Member of the House of Lords Lord Temporal |
| Term Start: | 30 September 1952 |
| Term End: | 7 March 1966 Hereditary Peerage |
| Predecessor: | The 2nd Viscount Astor |
| Successor: | The 4th Viscount Astor |
| Office2: | Member of Parliament for Wycombe |
| Term Start2: | 25 October 1951 |
| Term End2: | 30 September 1952 |
| Predecessor2: | John Haire |
| Successor2: | John Hall |
| Office3: | Member of Parliament for Fulham East |
| Term Start3: | 14 November 1935 |
| Term End3: | 15 June 1945 |
| Predecessor3: | John Wilmot |
| Successor3: | Michael Stewart |
| Birth Name: | William Waldorf Astor II |
| Birth Date: | 13 August 1907 |
| Birth Place: | Cliveden, Buckinghamshire, England |
| Death Place: | Nassau, Bahamas |
| Parents: | Waldorf, 2nd Viscount Astor Nancy Langhorne |
| Spouse: | |
| Children: | 4, including William, 4th Viscount |
| Occupation: | Businessman, politician |
| Alma Mater: | Eton College New College, Oxford |
| Relatives: | Astor family |
William Waldorf Astor II, 3rd Viscount Astor (13 August 1907 – 7 March 1966) was an English businessman and Conservative Party politician. He was also a member of the Astor family.
William was the eldest son of Waldorf Astor and Nancy Witcher Langhorne (by marriage, Viscountess Astor). He was educated at Eton and at New College, Oxford.
In 1932, Astor was appointed secretary to Victor Bulwer-Lytton, 2nd Earl of Lytton, at a League of Nations Committee of Enquiry in what was then known as Manchuria. First elected to the House of Commons in 1935, he served as a Conservative Member of Parliament (MP) for Fulham East until 1945. Between 1936 and 1937 he was Parliamentary Private Secretary to the First Lord of the Admiralty, Samuel Hoare, who was then made Home Secretary in the new cabinet of Neville Chamberlain in 1937.
In World War II, he served as a naval intelligence officer, acquiring no distinction, but gaining many influential contacts.[1] He returned as the Conservative MP for Wycombe in the 1951 general election, serving for ten months. On his father's death in 1952, he inherited his peerages, becoming the 3rd Viscount Astor and Baron Astor, with a seat in the House of Lords. This forced a by-election in Wycombe, which was won by the Conservative candidate John Hall.
Astor then took over the family's Cliveden estate in Buckinghamshire, where he and his family continued to live until 1966. Active in thoroughbred horse racing, he inherited Cliveden Stud, a horse farm and breeding operation in the village of Taplow near Maidenhead.
During the 1963 Profumo affair, Astor was accused of having an affair with Mandy Rice-Davies. In response to being told during one of the trials arising out of the scandal that Astor had denied having an affair with her, Rice-Davies famously replied, "Well he would, wouldn't he?"
Astor married three times:[2]
William married Sarah Norton (20 January 1920 – 4 February 2013; daughter of Richard, 6th Baron Grantley) on 14 June 1945 and they were divorced in 1953. They had one son together:
William married Phillipa Victoria Hunloke (10 December 1930 – 20 July 2005, whose maternal grandfather was Victor Cavendish, 9th Duke of Devonshire) on 26 April 1955 and they were divorced on 3 June 1960. They had one daughter together:
William Astor married, finally Bronwen Alun-Pugh on 14 October 1960. They had two daughters:
Astor died in Nassau, Bahamas, aged 58 from a heart attack[3] and was buried in the Octagon Temple at Cliveden.[4] His son succeeded him in the viscountcy.