Pierre Louis Jean Ivolas (7 April 1842, in Sète – 29 June 1908, in Tours) was a French naturalist.
[1] A professor at the Lycée Descartes in Tours, he is remembered for geological studies of central France and botanical investigations of Indre-et-Loire.
He was a good friend of the botanist Ernest Henry Tourlet — Ivolas took over the completion of Catalogue raisonné des plantes vasculaires du département d'Indre-et-Loire[2] following the death of Tourlet in 1907.
[3] In 1879, he became a member of the Société Botanique de France.
[4] His herbarium is kept at the Herbarium of Montpellier University.