Prudnik (Czech: Prudník, German: Prudnik, Braune, Brdun, Brudnick) is a river of the Czech Republic and Poland. The river originates under the mountain Czapka. Its longest confluent is Złoty Potok.

The name of the river is a Bohemized form of "Prądnik". The name of it also became a name of the city of Prudnik.