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 the 3rd Baronet de Trafford. Later the same year, on 9 August, he married Violet Alice Maud Franklin, daughter of James Franklin. They had four children: Sir Humphrey served as an officer of the Lancashire Hussars Imperial Yeomanry, and was promoted Major 1 July 1901.