The Mrassu or Mras-Su (Russian: Мрассу́[1] or Мрас-Су́,[2] Shor: Прас, Пырас, Пырас-суғ, romanized: Pras, Pıras, Pıras-suq) 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.

The water flow at Myski averages at 155 square meters per second (1668 ft3/sec) every year with a minimum of 24.4 m3/sec (262 ft3/sec) in February and a maximum of 694 m3/sec (7470 ft3/sec) in May.

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