Théodore Achille Louis du Moncel (6 March 1821 – 16 February 1884) was a prominent French physicist and advocate of the use of electricity.
He invented many electrical devices and wrote several books.
He also worked as a popularizer of knowledge on electricity.
In 1879, he founded the journal La lumière électrique.
He is one of the founders of the Société Nationale des Sciences Naturelles et Mathématiques of Cherbourg.
He was conseiller général of the Manche département (1861–1870) (Canton of Cherbourg-Octeville-Sud-Ouest).
He was member of the French Academy of Sciences.