The Principality of Ryazan, later known as the Grand Principality of Ryazan, was a Russian principality from 1129 to 1521. Its capital was the city of Ryazan, now known as Old Ryazan, which was destroyed in 1237 during the Mongol invasions. The capital was moved to Pereyaslavl-Ryazansky, later renamed Ryazan.

Initially a part of the Principality of Murom,