|Mouth||Daugava (Western Dvina)|
|Length||136 km (85 mi)|
|Basin size||5,410 km2 (2,090 sq mi)|
|⁃ average||36.9 m3/s (1,300 cu ft/s)|
|Progression||Daugava→ Baltic Sea|
The Kasplya (Belarusian and Russian: Каспля) is a river in Smolensky, Demidovsky, and Rudnyansky Districts of Smolensk Oblast of Russia and in Vitebsk Region of Belarus, and a major left tributary of the Daugava. Its length is 136 kilometres (85 mi), the first 116 kilometres (72 mi) are in Russia, and the rest in Belarus. It joins the Daugava in the urban-type settlement of Surazh. The town of Demidov is situated on the Kasplya.
The source of the Kasplya is in Lake Kasplya in Smolensky District. It flows north, crosses the border with Demidovsky District and turns northwest. It flows through Demidov, and next to the selo of Boroda turns west, crosses Rudnyansky District and enters Belarus. There, it turns northwest again and enters the Daugava.