The Vop () is a river in Smolensk Oblast, Russia. It is a right tributary of the Dnieper. It is 158 km long, with a drainage basin of 3300 kmò. The average discharge is 22 mó/s.
The river was the site of intense combat operations in the Smolensk region in the period JulyâÂÂSeptember, 1941 as part of Operation Barbarossa.