The Voynishka reka (Bulgarian: Войнишка река) is a river in northwestern Bulgaria, a right tributary of the Danube.

[1] The river takes its source under the name Chichilka reka at an altitude of 664 m, less than a kilometer northwest of the summit of Chernoglav (858 m) in the northwestern part of the Balkan Mountains.

Downstream from the latter the river turns eastwards and 2 km southwest from Voynitsa it receives its tributary the Koromanitsa, passes through the villages of Bukovets and Tarlyane and flows into the Danube at an altitude of 32 m.[1] Its drainage basin covers a territory of 276 km2 and is situated between the basins of the rivers Topolovets to the north and northwest, the Vidbol to the south and southeast, and the Timok along the Babin Nos ridge to the west.

[1] The Voynishka reka flows entirely in Vidin Province.

There are six settlements along its course, the villages of Staropatitsa, Poletkovtsi, Chichil, Bukovets and Tarlyane, as well as the town of Dunavtsi.