Palazzo Cesi-Armellini, sometimes known plainly as Palazzo Cesi, is a late Renaissance building in Rome, important for historical and architectural reasons. The palace, which should not be confounded with Palazzo Cesi-Gaddi, Palazzo Muti-Cesi, or the destroyed Palazzo Cesi, placed also in Borgo near the southern Colonnade of St. Peter's square, is one of the few Renaissance buildings of the rione Borgo to have outlived the destruction of the central part of the neighborhood due to the building of Via della Conciliazione, the grand avenue leading to St. Peter's Basilica.