Palais Ephrussi is a former Ringstraßenpalais in Vienna. It was built for the Ephrussi family of financiers by Theophil Freiherr von Hansen, the architect of the Austrian Parliament Building. It is situated on the Ringstrasse, specifically Doctor-Karl-Lueger-Ring, opposite the Votivkirche.
Unlike traditional, baroque noble palaces in Vienna, the Palais Ephrussi was built in the late 19th century and is therefore considered a Ringstraßenpalais. It is up to five storeys high and build in the for its time typical neo-renaissance style.
The palace was heavily damaged during World War II. One whole wing was destroyed and has been replaced with a modern building which housed the OPEC for a while.
The remains of the palace are at present time occupied by the Headquarters of Casinos Austria.