Born at Hilliers, Petworth, Sussex on 14 May 1876, the third child and eldest son of J N C Davies-Colley, FRCS, surgeon to Guy's Hospital, and Sophia Margaret Turner, his wife. He was a brother of Robert Davies-Colley, FRCS and of Eleanor Davies-Colley, FRCS. He was at Westminster School from September 1889 till July 1894 during the head masterships of the Rev William Gunion Rutherford and the Rev James Gow. On 1 October 1894 he matriculated at Trinity College, Cambridge, graduated with second-class honours in the Natural Sciences Tripos, and proceeded to Guy's Hospital for his medical education. He practised first at Woking and then at Frensham, both in Surrey, until the outbreak of war. On 1 October 1916 he was gazetted temporary captain, RAMC and was placed in charge of the genito-urinary department at the Cambridge Hospital, Aldershot. He was promoted major in 1926 and was surgeon to the Cambridge Hospital until 22 October 1938, when he resigned. He died unmarried on 16 November 1938 and was buried in the Aldershot military cemetery.