Peter Shand Kydd (born 1925) was the stepfather of Diana, Princess of Wales and an heir to the wallpaper fortune built by his father Norman Shand Kydd. He is half-brother to the former champion amateur jockey William (Bill) Shand Kydd.

Shand Kydd sold the family business in 1962 and moved his family to Australia, where he became a sheep farmer.

After selling the sheep farm and returning to England, Peter Shand Kydd began an affair with Diana's mother Frances Burke Roche, Viscountess Althrop, while married to his first wife, Janet Munro Kerr . After the pair's respective divorces, they married on May 2, 1969 and lived in Buckinghamshire and Itchnour, West Sussex, finally settling on a 1,000 acre (4 km²) farm on the remote Scottish island of Seil. They separated in June, 1988 and later divorced after he left her for a younger woman.

By his first wife, Shand Kydd had three children. Their elder son, Adam, was born in 1954 and became a novelist ("Happy Trails"), before dying in Phnom Penh, Cambodia, in 2004, of a suspected drug overdose. Though he reportedly had been renting a $1,770-a-month villa, a UPI report noted he had been found dead in a hostel in the city's red-light distrct, in "a squalid room surrounded by blister packs of Valium, with 94 pills missing; along with Rivotril, an anxiety reducing drug; and Kamagra, a form of Viagra." He left an estate of a little more than a half-million pounds.

The Shand Kydds' younger son, John Shand Kydd, known as Johnnie, was born in 1959, and has won renown as a photographer, with more than 70 works in the collection of the National Portrait Gallery.