The Cathedral of Saint Demetrius (Russian Дмитриевский собор) is a cathedral in the ancient Russian city of Vladimir. It was finished in 1191 during the reign of the Grand Prince Vsevolod the Big Nest of Vladimir-Suzdal to the honour of Saint Demetrius of Thessaloniki. Being an important component of the White Monuments of Vladimir and Suzdal, the cathedral belongs to the World Heritage of UNESCO.