The Rawa (pronounced: Polish: ['rava] ⓘ; older name Roździanka) is a minor river (about 19.6 kilometres in total length) in Silesia, Poland.

Reported to be crystal clear in 1875, the industrialization of Silesia caused the river to become so polluted that all the fish died out by 1893.

So far new sewage treatment plants have been completed, and the plan is supposed to significantly improve the river's quality by 2010.

The primary reason for the regulation of the Rava's flow was the need to prevent flooding as mining continued to lower the level of local lands.

After the war, the German plans were continued by the government of the Second Polish Republic in the late 1920s, with the construction of a sewage treatment plant (no longer existing).