Henri Guydo was a French painter, poster artist, draftsman, and illustrator.

Baron Joseph Robert Guillaume Le Barrois d'Orgeval, born on August 22, 1868, in Le Teilleul, in the Manche department, took the pseudonym Guydo in 1888 when Paul Dolffus asked him to illustrate, along with others, his book Modèles d'artistes (published by Marpon & Flammarion).

He later also signed his work GO and sometimes Henri Guydo.

He began by contributing satirical and humorous drawings to magazines such as Gil Blas, Le Triboulet, Le Frou-frou, Je sais tout, Mon journal illustré pour les enfants (No. 21, February 18, 1922) and Le Journal pour tous. In 1892, he shared the artistic direction of Le Rire and Le Nouvel Échos, a collaboration that lasted until the 1920s. He was a tireless cartoonist for the press, with around forty periodicals publishing his work between 1890 and 1930, including L'Assiette au beurre.

His posters initially displayed an Art Nouveau style, such as Amara Blanqui (1893), Éden Casino de Trouville-sur-Mer, Aimée Eymard, Liqueur Hanappier, Agenda Buvard du Bon Marché, and others.

In 1905, he began a collaboration with La Semaine de Suzette that was to last until his death, during which time he illustrated around twenty books in the “La Bibliothèque de Suzette” collection. In 1907, he published the humorous album Les Tribulations d'un cancre bleu (Delagrave).

From 1911 onwards, he exhibited his paintings at the Salon des Artistes Indépendants and also at the Salon des Humoristes.

Authors such as Guy de Téramond, Pierre de Lano, Albert Lavignac, Jean Drault, Delly, Germaine Verdat, Rodolphe Bringer, and Léon Valbert called upon his talents as an illustrator. He illustrated nearly forty books for young people and popular novels.

He died in May 1930 in Vannes.