'Black Water') is a town in Osh Region, Kyrgyzstan, in the Fergana Valley.

During World War II, in 1942, the Artillery Training Centre of the Polish Anders' Army was based in Kara-Suu.

After the dissolution of the Soviet Union, the Uzbek authorities destroyed the main bridge across the river, but cross-border trade continued via improvised ropeways that ferried goods and people across.

Kara-Suu gained international prominence following the May 2005 unrest in Uzbekistan and massacre in nearby Andijan, after which refugees streamed across the border into Kyrgyzstan.

The Karasuu Bazaar in the Kyrgyz town of Kara-Suu is a highly important center of import of Chinese consumer goods into Southern Kyrgyzstan, Uzbekistan and Tajikistan, comparable with Dordoy Bazaar in Bishkek (which targets Northern Kyrgyzstan, Kazakh and Russian markets).