La Vermine du Lion (The Lion's Parasites) is a science fiction novel by French writer Francis Carsac, first published in paperback by Fleuve Noir in 1967. It was reissued by Super-luxe in 1978 and Eons in 2004. The first hardcover edition was issued after the author's death by La page blanche in December 1982 with a new preface by Jacques Tixier. To date no English translation has been published. The novel was dedicated to Carsac's American friends and science fiction writer colleagues Poul Anderson and L. Sprague de Camp, from whose works the author acknowledged borrowing some elements.