GUM is the main department store in many cities of the former Soviet Union, known as State Department Store during the Soviet era. Similarly-named stores operated in some Soviet republics and in post-Soviet states.
The most famous GUM is the large store facing Red Square in the Kitai-gorod area – itself traditionally a trading center of Moscow. As of 2020, the building functions as a shopping mall. Before the 1920s the location was known as the Upper Trading Rows.
As of 2020, GUM carries over 100 different brands, and has cafes and restaurants inside the mall.