Jules Casimir Wielhorski was a French painter and decorator born of Polish origin in Nancy in 1875. Wielhorski settled in Lorraine after his family was driven from Poland by the Russians in 1868.
Wielhorski is particularly known for producing decorative designs in the art nouveau style for the interior of the Hôtel Langham in Paris (now known as the 'Salle 1900' in the restaurant 'La Fermette Marbeuf').
Jules Wielhorski attended the School of Fine Arts from Nancy with Émile Larcher. He then went on to study at the École des Beaux-Arts in Paris and to work at the studio of Léon Bonnat who was a professor at the school. The artist was notably active in Paris between 1896 and 1898. Wielhorski's later paintings were influenced by the impressionists.
Wielhorski died in 1951 in Plouézec - a commune in the Côtes-d'Armor department in Brittany in northwestern France.