Ryazan Oblast is a federal subject of Russia. Its administrative center is the city of Ryazan, which is also the oblast's largest city.

Ryazan is the largest city and administrative center of Ryazan Oblast, Russia. The city is located on the banks of the Oka River in Central Russia, 196 km (122 mi) southeast of Moscow. As of the 2010 Census, Ryazan had a population of 524,927, making it the 33rd most populated city in Russia, and the fourth most populated in Central Russia after Moscow, Voronezh, and Yaroslavl.