Kārsava ( pronunciation (help·info); German: Karsau) is a town in Latvia. Kārsava is located in the historical region of Latgale near the border of Russia.
The ancient baltic tribe Latgalians inhabited the territory of Kārsava since the 8th century. There are several hillforts near town.
In 1763 a Catholic church was built in Kārsava. The town was located near the Rēzekne- Ostrov postal road and it saw rapid development when the St. Petersburg- Vilnius railway line was constructed nearby and the town became a trading centre.