Italo Gismondi was an Italian archaeologist.
He entered the Amministrazione delle Antichità e Belle Arti in 1910 and was named Director of the Ostia excavations where he remained for 44 years. From 1919 to 1938 he also served as the superintendent of antiquities for the city of Rome.
Ostia was the primary focus of Gismondi's work and he made fundamental contributions to its study. Gismondi was particularly interested in architectonic aspects of ancient building.
A trained architect, he carried out numerous projects, including a plan of the Imperial forums in Rome in 1933; the restoration of the northwest portion of the Baths of Diocletian and also work on the Planetarium of the same complex. Between 1935 and 1971 Gismondi worked to execute the famed model of Rome at the Museo della Civiltà Romana in EUR. The model, built on a scale of 1:250, is intended to represent the city of Rome at the time of the emperor Constantine.
Elsewhere in Italy Gismondi worked with the Soprintendenza alle Antichità degli Abruzzi and Molise, in Abruzzo and Molise, for the Soprintendenza of Umbria and for the Soprintendenza for excavation in Eastern Sicily.