Julien Foucaud (2 July 1847, Saint-Clément – 26 April 1904, Rochefort) was a French botanist.
From 1867 to 1885, he was an assistant teacher and teacher in several schools in the department of Charente-Maritime. In February 1885, he was appointed director of the naval botanical garden in Rochefort.
In February 1878, he became a member of the Société Botanique de France. Taxa with the specific epithet of foucaudii are named in his honor. In collaboration with Georges Rouy, he described numerous plant species.