The Ipeľ (Slovak; pronounced [ˈipeʎ]) or Ipoly (Hungarian) (German: Eipel, archaic Slovak: Jupoľ, Latin: Bolia[1][2]) is a 232-kilometre (144 mi) long river in Slovakia and Hungary, a tributary of the Danube River.

Its source is in central Slovakia in the Slovak Ore Mountains.

The Ipeľ flows through or creates the border of the Banská Bystrica and Nitra regions in Slovakia, and Nógrád and Pest counties in Hungary.

The following towns and villages are situated on the river, in downstream order:

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