William Thomas Horton (27 Jun 1864 – 19 Feb 1919) was a Belgian-born English artist, writer, and occultist connected to the symbolist and aestheticist movements.
He has been described as "the only illustrator who came near Yeats's ideal of a Symbolist art composed entirely of images that could be recognised as meaningful by instinct rather than because of cultural conditioning.
He continued his studies at the Royal Academy in London, but gave up on an architecture career in the early 1890s.
Subsequent books included an illustrated volume combining Edgar Allan Poe's "The Raven" and "The Pit and the Pendulum" (Leonard Smithers, 1899), a nursery rhyme collection titled The Grig Book (1900), and The Way of a Soul (1905), which was both written and illustrated by Horton.
[citation needed] His friends included Yeats, H. Rider Haggard, Lady Gregory, and the writer Roger Ingpen, who edited and published a posthumous collection of Horton's drawings.