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.

The family moved to Rotherfield Peppard in Oxfordshire where their large house, The Grove, had its own stables.

[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.