| Honorific Prefix: | Cav. Uff. Abate Prof. |
| Pietro Perreau | |
| Birth Date: | 27 October 1827 |
| Birth Place: | Piacenza, Duchy of Parma |
| Death Place: | Florence, Italy |
| Alma Mater: | Alberoni College |
| Discipline: | Oriental studies |
| Sub Discipline: | Rabbinic literature |
| Workplaces: | National Library of Parma |
Pietro Perreau (27 October 1827 – 1911) was an Italian librarian and Hebraist.
Pietro Perreau was born in Piacenza on 27 October 1827. His father was an engineer with origins in Franche-Comté, and his mother a member of the local aristocracy. He studied in the Alberoni College of his native town from 1844 to 1849, and continued to study philology and philosophy until 1853. In 1854 he became a teacher of Greek, German, and history at the Collegio Carlo Alberto in Moncalieri, and between 1855 and 1856 he taught Greek and German at the in Parma.
Perreau was appointed director of the Landiana Library in his native city in 1857. Three years later, he was placed at the head of the Oriental collection in the National Library of Parma, of which he was made chief librarian in 1876. He was a member of the, and active in a number of Orientalist societies. Notably, Perreau was one of two vice-presidents at the Fourth International Congress of Orientalists in Florence in 1878.
Though himself a Catholic priest, he was an avowed philosemite who published historical, literary and scientific studies in various Jewish journals, including the Antologia Israelitica and the Vessillo Israelitico. Prior to 1860 Perreau had written on various subjects, but from then on he devoted himself exclusively to rabbinical Jewish literature.
Among other works, Perreau published a polygraphic edition of the commentary of Immanuel of Rome on the Psalms (Parma, 1879–82), on Esther (1880), and on Lamentations (1881). He also published the Ma'amar Gan 'Eden of Rabbi Ḥayyim Israel, in the Zunz Jubelschrift, and Oceano dello abbreviature e sigle ebraiche, caldaiche, rabbiniche, talmudiche, cabalistiche, geographiche, etc. (Parma, 1883; polygraphic edition), a lexicon of Hebrew abbreviations.