The Pronya is a river in the Ryazan and Tula oblasts in Russia. It is a right tributary of the Oka. The length of the river is 336 kilometres. The area of its basin is 10,200 square kilometres. The river freezes up in late November and stays icebound until early March. The Pronya is navigable in its lower reaches. The town of Mikhaylov is located on the Pronya.