MOMus-Museum of Modern Art-Costakis Collection (formerly: State Museum of Contemporary Art) is entrusted with the preservation, study and promotion of (mostly visual) modern art achievements, particularly those connected to the internationally renowned Costakis Collection with works of art from the avant-garde period in the Russian Empire and the Soviet Union (1900-1930), as well as the works of Greek and international artists that represent the art movement of modernism.
The museum's main organisational goals also include educating the public, producing scientific publications and ensuring that the works of its collections gain international visibility and recognition through collaborations with other institutions and museums in Greece and abroad.
The museum also actively supports research and welcomes scientists and students interested in the Russian avant-garde as well as its connection from the historical avant-garde movements in Europe up to the present time.