The Iványi (Hungarian: Iványi-patak) originates in the Mátra range at nearly 470 metres above sea level, south of Mátraterenye, Nógrád County, Hungary.

It is a left tributary of the Zagyva.

The stream flows northward and reaches the Zagyva north of Mátramindszent.

The Tószeri flows into it not far from Mátraterenye.