Victorin Joseph Léonce Rossignol de Joncières known as Léonce de Joncières (February 14, 1871, Dompierre-sur-Mer, Charente-Maritime - March 4, 1952, Avignon, Vaucluse) was a French painter, watercolorist, illustrator and poet.

Born in Dompierre-sur-Mer on February 14, 1871, Léonce was the son of the musician Victorin de Joncières – then a military officer and mobilized due to the Franco-German conflict – and Louise Jenny Berliner. He has a younger brother, André de Joncières, who will become a highly respected journalist.

In 1891, Léonce was admitted as a student at the School of Fine Arts in Paris. His teachers were William Bouguereau, Tony Robert-Fleury and Luc-Olivier Merson2. After having twice attempted the Prix de Rome in painting, he exhibited for the first time at the Salon of French Artists in 1897, showing two paintings of religious inspiration, including Jesus tempted by the demon, and received the medal of honor.

In 1907, having become a member of the Society of French Artists, he received the silver medal. Subsequently, he became a member of the Salon d'Automne in 1905. Joncières legally delivered illustrations and texts to various periodicals such as L'Album des Légendes (1894), Le Journal, the Revue des Deux Mondes, the Revue de Paris (1899)... He published works as an author of poetry and illustrated them. He received the Archon-Desspérouses prize in 1897 for his collection of poems, L'Âme du sphinx.

Joncières is a regular visitor to Cabourg; in July 1907, he met Marcel Proust there. On August 4, 1914, he was named a knight of the Legion of Honor, with the actor Albert Lambert as his godfather. Also linked to Henri Bataille, he composed a work for the stage, Fabienne ou le Fil d'Ariane created at the Comédie-Française in 1919-1920. He was also a close friend of Liane de Pougy.

He exhibited at Georges Petit in the 1920s and at the Salon des artistes français until 1937, including a large number of interior scenes.

Léonce de Joncières died on March 4, 1952 in Avignon