Sir Humphrey Edmund de Trafford, 4th Baronet MC JP DL (30 November 1891 – 6 October 1971) was a prominent English racehorse owner, and the grandfather of Brigadier Andrew Parker Bowles.
He was the son of Sir Humphrey de Trafford, 3rd Baronet, and Violet Alice Maud Franklin.
Born in London,[1] Trafford was educated at The Oratory School and the Royal Military College, Sandhurst.
They had four daughters: Trafford was an amateur rider and racehorse owner and a member of the Jockey Club and its National Hunt Committee.
In 1926, he purchased the Newsells Park Estate, Barkway near Royston, Hertfordshire as a home for his family and established a stud farm there, from which he bred most of his famous racehorses including Alcide who won the 1958 St. Leger Stakes and the 1959 King George VI and Queen Elizabeth Stakes and Parthia, who won the 1959 Epsom Derby.