Gilles Berr, known as Gil Baer, was a French cartoonist and illustrator.

Berr was the son of the lithographer Léopold Berr, originally from Strasbourg.

In 1885, he was ordered by the German courts to pay 600 marks for not having completed his national service, even though he had done so in France.

He enjoyed a certain amount of success from 1883 onwards. In 1887, he married Marie-Thérèse Bloch. His wife was particularly well connected in the literary and artistic world.

During the First World War, he illustrated numerous humorous postcards.

He illustrated books by Michel Corday, Jean Valgorge, Charles Talbere, etc. He drew for illustrated newspapers such as La Chronique parisienne, Le Petit Français illustré, Jean qui rit, Le Pèle mêle, Le Rire, Les Annales Politiques et Littéraires (see issue of November 9, 1924), Paris s'amuse (for example, in issue 14 of 01-14-1905), L'Assiette au beurre, and la Collection des cent.

He was made a Knight of the Legion of Honor in 1926.