Vydrica (Hungarian: Vödric, German: Weidritz) is a small 17 km long river in south-western Slovakia, which originates in the Little Carpathians mountains at about 450 m AMSL and flows into the Danube through the capital Bratislava.

The river passes through the Bratislava Forest Park and enters the Danube in Karlova Ves borough.

It flows south-west through the Bratislava Forest Park, collecting an unknown tributary and feeding two man-made water basins.

Vydrica then flows around the Hrubý Drieňovec mountain (396,7 ASML) and it collects its right tributary Bystrička as it enters the area of the upper Mlynská dolina and flows through Partizánska lúka (Partisan meadow) and the neighboring Železná studienka (Iron well), where it feeds four fish ponds.

[1] Vydrica then flows mainly southward through Patrónka, lower Mlynská dolina until it enters the Danube near the Lafranconi bridge and the Botanical Garden of the Comenius University.