Palazzo Valentini is a Palace in Rome near Piazza Venezia. Since 1873, the year belongs to the city administration.

The Palazzo was built by order of cardinal Michele Bonelli, nephew of Pope Pius V, who in 1585 bought from Giacomo Boncompagni Palace that stood on the Piazza dei Santi Apostoli. Today Palazzo Valentini is separated from the square street via the Quattro Novembre. The cardinal also was the owner of extensive land at the Palazzo on the site which once housed the forums of Trajan and Augustus. In those years, this plot of land was going through the stage of development and urbanization – that was then created around Alessandrino (cardinal came from the province of Alessandria). In the 1920-1930-ies quarter was destroyed during the creation of the via dei Fori Imperiali.

Tropezienne form Palazzo Valentini was designed by architect Domenico Paganelli and built in just three years, thanks to a massive investment by the cardinal. In the 17th century, the building underwent a number of modifications and extensions, and has even been partially destroyed and rebuilt by Francesco Peparelli for the new owner, cardinal Renato Imperiali, which marked the beginning of a library of 24 thousand volumes. In the early 18th century in the building for some time worked as a private theatre in which he performed outstanding musicians – Handel, Alessandro Scarlatti, Arcangelo Corelli, and others.

In 1827, the Palazzo was purchased by the Prussian banker Vincenzo Valentini, whose name the building bears today. The Palace was once again expanded and rebuilt, and its new owner has posted here his collection of paintings and archaeological collection (don't forget about the impressive library). Today in Palazzo Valentini you can see the statue of Odysseus work Hugo Attardi and "Aeneas and Anfisa" and "Europe" Sandro Chia.

During recent archaeological excavations beneath the foundations of the Palazzo was found a small thermal complex, probably formerly part of a big thermal baths, found in the early 20th century during the construction of the nearby Palazzo della Assicurazione di Venezia. Ruins of baths open to inspection.