Église Saint-Aignan, Parish church in Chartres, France

Église Saint-Aignan is a parish church in Chartres whose present building dates from the early 16th century, with Flamboyant pillar profiles and tympana giving way to antique-style colonnettes of the Renaissance. Its late 15th-century crypt is lit by windows opening onto the lower rue Saint-Pierre, and the small north-aisle portal is dated 1541. The nave was covered with wooden shingles and the aisles with a triforium.

The church was built around 1500 during the late Gothic period and officially designated a historical monument in 1840. This early recognition reflected growing awareness of the building's importance to French heritage.

The church is named after Aignan, bishop of Orléans around 400, and tradition holds that a 5th-century church he founded on this site contained his tomb. Saint-Aignan served as the parish of the counts of Blois and Chartres. Twenty stained-glass windows are listed as historical objects, including a 1547 panel of Saint Michael fighting Lucifer in the Saint-Michel chapel.

The church is located in central Chartres and can be reached on foot from nearby historical sites. Morning and early afternoon hours offer the best light for viewing the interior details and architectural features.

The west rose window, "Jesus Sun of Justice", dates from the early 17th century. Since 1988, instruments such as wire convergence meters in the ambulatory bay and a crack gauge under its vault have monitored structural deformation; in July 2024 the ambulatory was closed to visitors because of falling stones.