Pronya River (Russian: Проня) is a river in Ryazan and Tula Oblasts in Russia, a right tributary of the Oka River. The length of the river is 336 km. The area of its basin is 10,200 km². The river freezes up in late November and stays icebound until early March. The Pronya is navigable in its lower reaches. The town of Mikhailov is located on the Pronya River.