The Mrassu or Mras-Su (Словарь названий гидрографических объектов России и других стран — членов СНГ, Federal Service for Geodesy and Cartography of Russia, 1999, p. 255 or Мрас-Су́, ) is a river in Kemerovo Oblast, Russia. It is a left tributary of the Tom (in the Ob's drainage basin), and has its sources in the Abakan Range. It is long, with a drainage basin of . The Mrassu joins the Tom near Myski.
The Mrassu freezes from mid-November to April. The water flow at Myski averages at 155 square meters per second every year with a minimum of in February and a maximum of in May.
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