Diana Farr (née Pullein-Thompson; 1 October 1925 – 21 September 2015), was a British horsewoman and writer known for her pony books.

Her mother and two sisters also wrote and together they created a large number of children's books, many of which were on the theme of horses.

Her father, Harold Pullein-Thompson, had the Military Cross and her mother, Joanna Cannan, was a prolific and successful author.

[2] He had been a teacher but he then sold fridges and had a game company,[3] but it was her mother who made more money writing pony books on the kitchen table.

[3] In time they would describe their country childhood in their joint autobiography Fair Girls and Grey Horses (1996).

[3] When Diana was fourteen and her big sister fifteen they abandoned education and started a riding school at their home.

Christine went to Virginia, but Diana was denied entry to the USA in 1952 as the medical revealed that she had tuberculosis.