James Wentworth Day (21 April 1899 – 5 January 1983) was a British writer and broadcaster, of the Agrarian Right school and essentially a High Tory.
He lived for most of his life in East Anglia, an area which would always be his first love; he had a particular interest in wildfowling, and at one time owned Adventurers' Fen, a piece of marshland in Cambridgeshire.
He was also a ghost hunter, and wrote several books about this interest.
He may be best remembered for his journey around the farms of East Anglia on horseback during World War II, as detailed in his book Farming Adventure (later reprinted under the title Wartime Ride), while for many years he was closely associated with the East Anglian magazine.