Mała Wisełka (the former Polska Wisła, German: Polnische Weichsel) is a branch of the Vistula river in the town of Toruń in Poland.

The Vistula and the Mała Wisełka are forming the island Kępa Bazarowa (German: Bazar-Kämpe).

The forking of the Vistula (Wisła) into its distributaries the main stream and the Small Vistula (Mała Wisła or Wisełka) created 16 small islands (German: Kämpe, Polish: kęp) like Kępa Bazarowa, Liszka, Winnicza Góra, Białkowa, Wszowka, Cegielniana, Strońska, Starotoruńska, Krowaniec, Grodzisko, Korzeniec und Kępa Zielona.

In February 1411 after the First Peace of Thorn, Kępa Bazarowa became the border between the Teutonic Knights in the north and the Kingdom of Poland in the south.

Nowadays the eastern part of the Mała Wisełka is the border between the districts (dzielnica) Piaski and Rudak of the city of Toruń.