Hesketh Raoul Lejarderay Millais (4 October 1901 – 24 November 1999), usually known as Raoul or 'Liony' Millais was a portrait painter, equestrian artist and sportsman.

Millais was the grandson of the Pre-Raphaelite painter Sir John Everett Millais and the son of naturalist John Guille Millais, from whom he inherited both his artistic talent and his love of animals and of hunting.^{[1] [2]}

Millais is best known for his equestrian paintings and for his Spanish work, created when he accompanied Ernest Hemingway.^[3][4] Like his contemporary, Alfred Munnings, Millais was an opponent of Modernism in art, which he called "the Picasso lark".^[3]

Numerous painted works by Millais have been sold at auction at Christie's,^[5][6] and Bonhams^[7] in London. His oeuvre has been posthumously profiled in publications such as Artnet,^[4] The Independent,^[8] The Field,^[9] and Art UK.^[10]

He married Elinor Clare Macdonell,^[11] daughter of railroad magnate Allan Ronald Macdonell and Margaret Helen Ryan (heir and niece of Hugh Ryan), of Montreal, Canada.^[12][13][14] Millais and Elinor and had two sons, John Millais (b. 1927) and Hugh Geoffroy Millais (b.1929) who became a celebrated actor.^[15]

After Elinor's death in 1953, Millais married his second wife Kay Prior Palmer with whom he had a third son, Hesketh Merlin.

He died in 1999 in his 99th year in Oxfordshire, England.