Émile Joachim Constant Puyo was a French photographer, active in the late 19th and early 20th centuries. As the leading advocate of the Pictorialist movement in France, he championed the practice of photography as an artistic medium. For most of his career, Puyo was associated with the Photo Club of Paris, serving as its president from 1921 to 1926. His photographs appeared in numerous publications worldwide, and were exhibited at various expositions in the 1900s.