Louis Désiré Blanquart-Evrard (2 August 1802, Lille – 28 April 1872, Lille) was a French cloth merchant by trade, but in the 1840s became a student of photography. He studied the Calotype process, and in 1847 became the first person to publish the process in France. He developed a method of bathing the paper in solutions of potassium iodide and silver nitrate rather than brushing these chemical baths on the surface.