The Bezdna () or Pasna () is a river in Chuvashia, Russian Federation, a right-bank tributary of the Sura. It is long, and has a drainage basin of .
Major tributaries are Abamza, Orbezdna, Black Bezdna. The maximal mineralization 500âÂÂ700 mg/L. Average sediment in mouth per year is 71 mm. Drainage is regulated. In the upper stream use to dry.