The Alchymist's Cat is a dark fantasy novel for children by British author Robin Jarvis. It is the first book in The Deptford Histories trilogy, a series of prequels to Jarvis's Deptford Mice books. Set in 17th century London, it serves as a backstory for the original trilogy's main antagonist, Jupiter. It was first published in the United Kingdom in 1991 by Macdonald Young Books. In 2004, it was published in the United States by Chronicle Books as The Alchemist's Cat.