The Pullein-Thompson sisters — Josephine Pullein-ThompsonMBE (3 April 1924-), Diana Pullein-Thompson (born 1 October 1925) and Christine Pullein-Thompson (1 October 1925–2 December 2005— are British writers of several horse and pony books (mostly fictional) aimed at children and mostly popular with girls. They started at a very young age (initially writing collectively) and they were at their peak in the 1950s and 1960s, but their popularity has endured. They have written a collective autobiography Fair Girls and Grey Horses.
All 3 sisters have written at least 1 book under a different name; Josephine wrote 1 under the pseudonym of Josephine Mann, Diana 3 books under her married name of Diana Farr and Christine wrote 2 books under the name of Christine Keir.
Their mother, Joanna Cannan (1898–1961), sister of the poet May Cannan, wrote similar equestrian stories, but is better known for detective mysteries.