The Pullein-Thompson sisters - Josephine Pullein-Thompson (1924-), Diana Pullein-Thompson (1925-) and Christine Pullein-Thompson (1925-2005) - are British writers who have written innumerable horse and pony books (mostly fictional) aimed at children, but 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 to a greater extent than some would have imagined. They have written a collective autobiography Fair Girls and Grey Horses.

Their mother, Joanna Cannan (1898-1961), sister of the poet May Cannan, wrote similar equestrian stories, but is better known for detective mysteries. Their father was Captain Harold J "Cappy" Pullein-Thompson, who was badly injured during the first world war. Consequently he made his money by selling refrigerators, and did not publish any works. They also have a brother Denis Cannan who is an author in his own right, though has published nowhere near as many works when compared to his sisters. His work tends to be mainly plays.

They are also related to the British novelist and dramatist Gilbert Cannan and the academic Charles Cannan. Joanna Cannan and May Cannan were daughters of Charles Cannan making Gilbert Cannan their cousin. Diana later wrote an autobiography of Gilbert Cannan's life. Their father was brother of Emily Muriel Pullein Thompson who was the mother of John Gardner (composer) who is therefore also their cousin.

Christine had four children as a result of marriage; two sons and two daughters. Her marriage was to Julian Popescu in 1954. One of her daughters Charlotte Popescu is an author in her own right, publishing children's pony books. However they are not as widely known as her mother's or her aunts'. Her other children were called Phillip, Mark and Lucy. In addition she had 8 grandchildren (Oliver, Daniel, Anna, Benjamin, Thomas and Hamish, Edwina and Maxwell). Diana married art historian Dennis Farr, and had 2 children (one son, one daughter).

Like their mother, the National Portrait Gallery in London also holds a picture of them.

The sisters' books are strongly oriented towards ponies and for almost 60 years they have been much loved by young girls with a strong enthusiasm for horses and ponies. Diana has often written books aimed at a slightly older audience, including some set in London. Christine was the most prolific and also wrote a number of stories which are not specifically concerned with horses or ponies; these are mostly aimed at younger children. Apart from the books listed below, all three sisters have also edited and contributed to various anthologies of horse and pony stories. Their titles include:

"Sisters" is a popular song written by Irving Berlin in 1954.

The song appeared in the movie White Christmas where it was sung by Rosemary Clooney multitracking. .

The movie White Christmas also stared Bing Crosby and Danny Kaye. It was not possible to issue an "original soundtrack album" of the film, because Decca controlled the soundtrack rights, but Clooney was under exclusive contract with Columbia Records. Consequently each one issued a separate "soundtrack recording": Decca issuing Selections from Irving Berlin's White Christmas‎, while Columbia issued Irving Berlin's White Christmas‎. On the former, the song "Sisters" (as well as all of Clooney's vocal parts) was recorded by Peggy Lee, while on the latter, the song was sung by Rosemary Clooney and her own sister, Betty. The Clooney sisters' version, which was also released as a single, was the most popular recording of the song, charting in 1954. The song was also made famous in the United Kingdom by sister act the Beverley Sisters.

A 2004 album of songs made famous by Rosemary Clooney, done by Bette Midler, included a version of the song done by Linda Ronstadt and Midler.