Marc Simonetti (born in 1977) is a French conceptual artist and illustrator. He worked on Valérian and the city of a thousand planets directly with Luc Besson as well as on a dozen films with the Moving Pictures Company LA, including the latest Aladdin and Maleficent 2.

He is best known for his work on GRR Martin's Game of Throne. He has also illustrated some of the best-known fantasy and science fiction novels, such as Terry Pratchett's Discworld, Robin Hobb's trilogy The Royal Assassin, Patrick Rothfuss's Name of the Wind, Terry Brook's The Shannara Cycle, or Frank Herbert's Dune. He has also worked for numerous video game companies such as Activision, Ubisoft, Magic The Gathering, EA, Square Enix and King Isle Entertainment.