Black cube

Black cube may refer to:

• Black Cube, a private intelligence agency
• Black Cube Nomadic Art Museum, a nonprofit contemporary art organization producing site-specific art in the public realm.
• Blackballing, a vote of rejection in a secret ballot
• The Kaaba, a black cubical building at the center of the Grand Mosque of Mecca; it is the most sacred site in Islam
• Tefillin, a small black leather cube used by Jews during prayer