Marie Hypolite Irénée Thériot (21 December 1859 – 25 March 1947), credited as Irénée Thériot was a French bryologist and school teacher.Thériot's personal herbarium collection is currently housed at the Muséum national d'histoire naturelle.
Jules Cardot named the genus Theriotia in honor of Thériot.The standard author abbreviation Thér.
is used to indicate this person as the author when citing a botanical name.