The House of the Unions (Russian: Дом союзов) (also called Palace of 'the Unions) is a historical building in the Tverskoy District in central Moscow, Russia. It is situated on the corner of Bolshaya Dmitrovka and Okhotny Ryad streets.
The first building on this location was constructed in the early 1770s, and originally belonged to Moscow Governor General Vasily Dolgorukov-Krymsky. In 1784 it was purchased by the Moscow Assembly of the Nobility (Благородное собрание) to serve as a Ball venue for the Russian nobility.
Between 1784 and 1787 the original building was redesigned and rebuilt by Russian architect Matvey Kazakov. In particular, Kazakov added the monumental Pillar Hall (Колонный зал) in place of the interior courtyard of the building. The hall was named after 28 internal Corinthian columns, all wood with white faux marble finish.
In 1860 Russian Musical Society began a tradition of symphony concerts in the Pillar Hall. Their organizer and conductor was Nikolai Rubinstein.
Today the building's appearance is still very close to Kazakov's original, despite numerous exterior alterations (the last of which was made in 1903-1908).
In addition to the Pillar Hall, the building houses several other large rooms such as the October Hall, Hall No 1 (the Round Hall), Hall No 2 (the Banquet Hall), and numerous lobbies.
After the October Revolution the building was assigned to the Moscow Council of Trade Unions, hence its current name.
During the Soviet decades it mostly served as a place for important State events, i.e. housing the Communist Party Congresses and conferences, and governmental award ceremonies, and also as a concert platform for classical and popular music performances including those by Emil Gilels, Gennady Rozhdestvensky, Klavdiya Shulzhenko and Lev Leshchenko.