Léon Jallot (1874–1967) was a French designer, decorator, and architect associated with the later phase of Art Nouveau and the emergence of Art Deco. Trained at the École Boulle in Paris, he developed a refined approach to furniture and interior design that combined historical forms with stylized natural motifs. Early in his career, he collaborated with leading figures such as Louis Majorelle, contributing to the evolution of modern decorative arts in France. Jallot exhibited regularly at major salons, including the Salon d’Automne and the Société des Artistes Décorateurs, where his work was noted for its craftsmanship, elegant proportions, and inventive ornament. Over time, his style shifted from the fluid lines of Art Nouveau toward a more restrained, geometric language, reflecting broader changes in early twentieth-century design.