Sir Humphrey Francis de Trafford (3 July 1862 – 10 January 1929) was an English landowner and racehorse breeder. He was the son of Sir Humphrey de Trafford, 2nd Baronet and Lady Annette Mary Talbot.

On the death of his father on 4 May 1886, Humphrey became became the 3rd Baronet de Trafford

De Trafford Baronets

The de Trafford Baronetcy, of Trafford Park in the Metropolitan Borough of Trafford, Greater Manchester, is a title in the Baronetage of the United Kingdom. It was restored after the Catholic Emancipation, by Royal Decree on 7 September 1841, for Thomas de Trafford...

. Later the same year, on 9 August, he married Violet Alice Maud Franklin, daughter of James Franklin. They had four children:

• Humphrey Edmund, born 30 November 1891, who became the Fourth Baronet. he died without male issue on the 6th October 1971.
• Violet Mary, born 8 May 1893, she married first to Captain Rupert OD Keppel in 1919, this marriage was annulled in 1921, she then married Colonel Keith Graham Menzies in 1922. She died on the 28th February 1968.
• Rudolph Edgar Francis
  Rudolph de Trafford
  Sir Rudolph Edgar Francis de Trafford OBE, 5th Baronet was a British aristocrat and banker who succeeded his brother to the de Trafford baronetage at the age of 77. Rudolph was born on 31 August 1894, the second son of Sir Humphrey de Trafford, 3rd Baronet and Violet Alice Maud Franklin.He attended...
  
  , born 31 August 1894, who became the Fifth Baronet in 1971 upon the death of his elder brother Humphrey. He died in 1983
• Raymond Vincent, born 28 January 1900, He married Alice de Janzé
  Alice de Janzé
  Alice de Janzé, née Silverthorne , also known as Alice de Trafford and holder of the noble title Comtesse de Janzé for a few years, was an American heiress who spent years in Kenya, as a member of the Happy Valley set of colonials...
  
   (née Silverthorne) in 1932, they divorced in 1938, he then married Eve Drummond in 1951, he died on the 14th May 1971.

In 1896, Sir Humphrey put the family estate of Trafford Park

Trafford Park

Trafford Park is an area of the Metropolitan Borough of Trafford, in Greater Manchester, England. Located opposite Salford Quays, on the southern side of the Manchester Ship Canal, it is west-southwest of Manchester city centre, and north of Stretford. Until the late 19th century it was the...

 up for sale. The auction was held on 7 May 1896 in the Grand Hotel, Manchester. The estate was described in the sale catalogue as comprising a "distinguished family mansion of imposing elevation, built in the Italian style, seated in a beautifully timbered deer park". However it failed to reach its reported reserve price of £300,000. There was much public debate, before and after the abortive sale, as to whether Manchester Corporation ought to buy Trafford Park. But it could not agree terms quickly enough, and so, on 23 June 1896, Ernest Terah Hooley became the new owner of Trafford Park, for the sum of £360,000.

In 1903 Sir Humphrey served as president of the Royal Lancashire Agricultural Society and in 1905, he published Foxhounds of Great Britain and Ireland and their Masters and Huntsmen.

In July 1907, Sir Humphrey de Trafford caused scandal in European society circles when he was taken to court for bankruptcy

Bankruptcy

Bankruptcy is a legal status of an insolvent person or an organisation, that is, one that cannot repay the debts owed to creditors. In most jurisdictions bankruptcy is imposed by a court order, often initiated by the debtor....

 despite claiming an annual income of $240,000.

Lady Violet died on the 20th July 1925. Sir Humphrey died four years later on 10 January 1929, aged 66.

Correspondence and government accounts related to death duties payable on Sir Humphrey's estate are held by The National Archives, but remained sealed under a Lord Chancellor's Instrument until 2006.http://www.nationalarchives.gov.uk/catalogue/displaycataloguedetails.asp?CATLN=6&CATID=7983698&FullDetails=True&Gsm=2008-02-12