Florence Susan Harrison (1877–1955) was an English Australian Art Nouveau and Pre-Raphaelite illustrator of poetry and children's books. Many of her books were published by Blackie and Son. She illustrated books by notable Pre-Raphaelite circle poets Christina Rossetti, William Morris and Sir Alfred Tennyson. Harrison has often been confused with Emma Florence Harrison, an English artist who exhibited at the Royal Academy in 1887.