Joseph-Théodore Deck was a 19th-century French potter, an important figure in late 19th-century art pottery. Born in Guebwiller, Haut-Rhin, he began learning the trade in his early 20s, moving to Paris at age 24. In 1856 he established his own faience workshop, Joseph-Théodore Deck Ceramique Française, and began to experiment with styles from Islamic pottery, and in particular the Iznik style.
When Japonisme arrived in the 1870s he embraced this and other art pottery trends with enthusiasm, finally conquering the French establishment when he was made art director of Sèvres porcelain in 1887. Several important figures from the next generation were trained by Deck, including Edmond Lachenal.
In the 1880s he also worked in the Chinese pottery tradition, also collaborating with Raphaël Collin, and other artists of the time. He died in Paris. In 1887 he published a treatise under the title La Faïence, which is available in facsimile online.