Giulio Cesare Fontana (12 February 1580, Rome - 9 June 1627, Naples) was an Italian architect and engineer, mainly active in Naples and its surroundings.
In 1612 viceroy Pedro Fernández de Castro, count of Lemos, commissioned him to convert the former cavallerizza into the Palazzo dei Regi Studi, which now houses the Museo Archeologico Nazionale di Napoli - nel frattempo operò nella sistemazione dei Regi Lagni. Around the same time he designed the grain pits in Largo Mercatello (now Piazza Dante) in Naples and worked on the Regi Lagni. In 1626 he designed the portale dell'Annunziata gateway in Aversa, took part in completing the oratory of San Carlo Borromeo near the church of Sant'Anna dei Lombardi - that church also contains the funerary monument to Domenico Fontana, designed by Giulio Cesare in 1627 but badly damaged during World War Two.[2]