François Pierre Le Roux (4.01.1832-1907) was a French physicist. He was born in Paris. He was professor at the Conservatoire des arts et métiers, at the Higher School of Pharmacy of the University of Paris and at the École Polytechnique.
His research was in the field of electromagnetism, thermoelectricity and optics. In 1862 he discovered experimentally the anomalous dispersion of light (in iodine vapour), and in 1867 the Thomson thermal effect.