The Netta [ˈnɛtta] is a river in north-east Poland, a right tributary of the Biebrza, approximately 20 kilometres (12 mi) long.

The Netta runs parallel to, or (on its upper and lower stretches) forms part of, the Augustów Canal, built in the 19th century to link the basins of the Vistula and the Neman.

The Netta begins its course in Augustów, where it flows out of Lake Necko and southwards through the town.

Shortly before its confluence with the Biebrza it passes through the villages of Polkowo and Dębowo.

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