The IHR's Italian collection contains over 3500 volumes which cover early medieval Italian history to the present. While the collection's main focus is on primary sources, there are also many supplementary guides, bibliographies, reference works and periodicals. The IHR also has a good collection of archival guides for Italy, ranging from the State Archives to the archives of little-known villages and monasteries.
There is an extensive set of the Fonti per la storia d'Italia series (Medievale and Moderni e Contemporanea) and other collections of sources. There are strong holdings for regional material covering the city-states and kingdoms of Italy, as well as chronologically organised material for Italy as a whole. The collection is particularly strong on the histories of Venice, Florence, Milan and southern Italy and Sicily.