Francesca Isabella Simon MBE (born 23 February 1955) is an American-born British author who resides in North London.
She is most famous for writing the Horrid Henry and Evil Evie series of children's books.
She also wanted to write about sibling rivalry and families where one child was considered "perfect" and the other "horrid".
Many of the Horrid Henry stories were inspired by events from Simon's life, including her childhood, and those of people that she knew, with additional ideas coming from her imagination.
Simon was appointed Member of the Order of the British Empire (MBE) in the 2023 New Year Honours for services to literature.