Palais Porcia is a former urban residence in the western quarter of the Innere Stadt of Vienna, Austria. It stands at 23, Herrengasse between Palais Kinsky and Palais Trautmansdorff and across Palais Harrach. The palace was built in 1546 for the descendants of Count Gabriel von Salamanca-Ortenburg. It was representative of the simple Renaissance style that emerged in Vienna in the middle of the 16th century. In the 17th and later centuries it was extensively remodelled in Baroque and Rococo styles but the inner court still contains an early Renaissance arcade. As of 2010, Palais Porcia houses the Administrative Library of the Austrian Federal Chancellery.