The Worst Witch is a series of children's books written and illustrated by English author Jill Murphy. The series are boarding school stories in a fantasy setting, with eight books published. The first, The Worst Witch, was published in 1974 by Allison & Busby, and the most recent, First Prize for the Worst Witch, was published in 2018 by Puffin Books, the current publisher of the series. The books have become some of the most successful titles on the Young Puffin paperback list and have sold more than 5 million copies.