Giuseppe Valadier (April 14, 1762 – February 1, 1839) was an Italian architect and designer, urban planner and archaeologist and a chief exponent of Neoclassicism in Italy.
Valadier also designed some furniture and other decorative arts, such as the rock crystal and silver reliquary for relics of the Holy Crib in Santa Maria Maggiore, for Pope Pius IX.
He was named official architetto camerale of the Papal States by Pope Pius VI in 1786.
He taught architecture at the Accademia di San Luca was a pioneer archeologist and a restorer of monuments, such as the Milvian Bridge (1805) and the Arch of Titus in Rome, (1819–21).
He retraced the ancient line of the Via Flaminia (1805) and restored Giacomo Barozzi da Vignola's neglected Church of Sant'Andrea in Via Flaminia, which influenced his own Church of Santa Maria della Salute in Fiumicino, the newly-establish port for Rome.