Sophia Margaret "Sophie" Gray (28 October 1843 – 15 March 1882), later Sophia Margaret Caird, was a Scottish model for her brother-in-law, the Pre-Raphaelite painter John Everett Millais. She was a younger sister of Euphemia "Effie" Gray, who married Millais in 1855 after the annulment of her marriage to John Ruskin. The spelling of her name was, after around 1861, sometimes "Sophy," but only within the family. In public she was known as Sophie and later in life, after her marriage, as Sophia.