Jacques Weismann, born Jacques Auguste Weismann, was a French painter, pastel artist, illustrator, and sculptor. He was the son of Théophile Gottlieb Weismann and Emma Pauline Koenigswerther.

He married Marthe Bickart on May 7, 1908.

Jacques Weismann was a student of Fernand Cormon, Paul-Émile Boutigny, and Ferdinand Humbert. Beginning in 1905, he exhibited at the Salon des Artistes Français, where he won the silver medal in 1923 and the gold medal in 1932. He was made a Knight of the Legion of Honor in 1930.

He exhibited his portraits, pastels, and paintings at the Salon des Indépendants, the Salon d'Automne, the Salon d'Hiver, the Maison des Artistes at 152 Boulevard Haussmann in Paris, and the Simonson Gallery. Among his best-known works are the portraits of Marshal Foch painted in 1921, exhibited at the Palais du Luxembourg, that of General Gouraud, and those of popular singers of the time, such as Tino Rossi, whose portrait he exhibited in 1937, and Jeanne Aubert in 1939.

He participated in the Salon des Artistes Français on May 17, 1940. It was probably following the enactment of discriminatory laws against Jews by the Vichy regime that we lost track of him that year, only to find one of his works signed under the name Jack Weiz, “Young Woman Rising by Candlelight.”

He lived for a long time at 11 boulevard Pereire in the 17th arrondissement of Paris.