The Diocese of Chartres (Latin: Dioecesis Carnutensis; French: Diocèse de Chartres) is a Latin Church ecclesiastical territory or diocese of the Catholic Church in France.

The diocese is a suffragan in the ecclesiastical province of the metropolitan Archdiocese of Tours.

[3] In 911, Bishop Gauscelinus used the Voile de la Vierge (Veil of the Blessed Virgin), as a standard when warding off the invading Normans.

[4] Fulbert was responsible for the advancement of the Nativity of the Virgin's feast day on September 8.

[6] The poet Charles Péguy (1873–1914) revived the pilgrimage route between Paris and Chartres before the First World War.