Armand Rassenfosse (6 August 1862 - 28 January 1934) was a largely self-taught Belgian graphic artist, book illustrator and painter. His masterwork was a set of illustrations for Charles Baudelaire's Les Fleurs du mal. Enormously successful, today the Maîtres de l'Affiche works are as rare as the original large format images and much in demand by collectors from around the world.