Pauline Diana Baynes (9 September 1922 – 1 August 2008) was an English illustrator, author, and commercial artist. She contributed drawings and paintings to more than two hundred books, mostly in the children's genre. She was the first illustrator of some of J. R. R. Tolkien's minor works and of C. S. Lewis's Chronicles of Narnia.
While Baynes was still a baby, her family emigrated to India, where her father had been appointed a Commissioner (district official) in the British imperial Indian Civil Service, serving as a senior magistrate. When Baynes was five, her mother, in poor health, took both her daughters back to England.
When Baynes was nine, she was sent to Beaufort School, an independent girls' boarding establishment, no longer extant, in Camberley. Her favourite subject there was art, "because it was easy".