The Kaczawa (German: Katzbach), in English Katzbach, is a river in the Lower Silesian Voivodeship in Poland. It springs from the Kaczawskie Mountains near Kaczorów and flows north and northeast through the towns of Świerzawa, Złotoryja and Legnica. Among its tributaries is the Czarna Woda. After a length of 98 km (61 mi) the Kaczawa empties into the Oder river at Prochowice.

Between Legnica and Dunino, the Kaczawa was the site of the Battle of the Katzbach on 26 August 1813 during the Napoleonic Wars.

• "Katzbach" . The American Cyclopædia. 1879.