The Oredezh River is a river in Volosovsky, Gatchinsky, and Luzhsky Districts in the south-western part of Leningrad Oblast, Russia, a right tributary of Luga River. The length of the river is , whereas the area of its drainage basin is . The principal tributary of the Oredezh is the Suyda (left). A cascade of hydroelectric plants was constructed on the upper course of the river in 1948.