Mary Eleanor Jessie Knox née Shepard (25 December 1909 – 4 September 2000) was an English illustrator of children's books. She is best known for the Mary Poppins stories written by P. L. Travers (1934 to 1988): "Mary Shepard: Putting Mary Poppins in the picture", The Times of London titled an obituary article. She used her married name Mary Knox outside the publishing industry.