Júlia Sardà is a Spanish artist who has illustrated many books for children, including Mary Who Wrote Frankenstein by Linda Bailey, The Liszts by Kyo Maclear. She has illustrated The Wolf's Secret by Nicolas Digard and Myriam Dahman, which won Foyles Children's Book of the Year 2020. Her work has been published around the world in many languages.

The Queen in the Cave was her debut to the Walker Books list and the first book she has both written and illustrated. It was longlisted for a Yoto Carnegie Award for Illustration 2023. She lives in Barcelona.