Philippe A. Barbier (born 1848, died 1922) was a French organic chemist. He is considered the father of organometallic chemistry having synthesized the first organomagnesium compound in 1899. He is most famous for the Barbier reaction.
Barbier was Victor Grignard's supervisor during his PhD. A method to prepare reactive Grignard reagents such as Allylic Magnesium halides is known as the Barbier method, where the Grignard reagent is made in situ with the other reagent.