Johan Coenraad Altorf (The Hague, 6 January, 1876 - The Hague, 11 December, 1955)
Dutch sculptor and ceramicist.
He trained at the Academie van Beeldende Kunsten in The Hague (1894–7) and in various sculpture studios. In 1898 he decorated the shop-front of the gallery Arts and Crafts in The Hague after a design by Johan Thorn Prikker, who advised him to set up on his own. From 1901 Altorf exhibited regularly and successfully; he was represented at the Prima Esposizione Internazionale d’Arte Decorativa Moderna in Turin in 1902, where he won a silver medal, and at the Exposition Internationale des Arts Décoratifs et Industriels Modernes in Paris in 1925.