Jean Ignace Isidore Gerard was a 19th century French illustrator and caricaturist who published under the pseudonym of J.J. Grandville.
Though the designs of Grandville are occasionally unnatural and absurd, they usually display keen analysis of character and marvellous inventive ingenuity, and his humour is always tempered and refined by delicacy of sentiment and a vein of sober thoughtfulness.
Grandville's ability for political provocation made his work much in demand. He worked in a wide variety of formats, from his first job illustrating the parlor game Old Maid, to illustrated newspaper strips of which he was a master. His illustrations for Le Diable à Paris ("The Devil In Paris"; 1844–46) were used by Walter Benjamin for his study of that city as an urban organism. One of Grandville's supreme achievements, at a time when French printing technology was ascendant, was Les Fleurs Animées, a series of images that are both poetic and satirical.