The Black Eagle tank (, or Obyekt 640) was a presumed prototype main battle tank produced in the Russian Federation. It was thought to have been developed by the KBTM design bureau in Omsk in the late 1990s. A production version of this tank has never been publicly demonstrated. The Black Eagle tank has been cancelled, and all production and development halted. The company that was developing the tank, Omsk Transmash, has subsequently gone bankrupt.