Rouen Cathedral is a Roman Catholic church in Rouen, Normandy, France. It is the see of the Archbishop of Rouen, Primate of Normandy. The cathedral is in the Gothic architectural tradition.

A church was already present at the location in the late 4th century, and eventually a cathedral was established in Rouen as in Poitiers. It was enlarged by St. Ouen in 650, and visited by Charlemagne in 769.

Construction on the current building began in the 12th century in Early Gothic style for Saint Romain's tower, front side porches and part of the nave. The cathedral was burnt in 1200. Others were built in High Gothic style for the mainworks: nave, transept, choir and first floor of the lantern tower in the 13th century; side chapels, lady chapel and side doorways in the 14th century. Some windows are still decorated with stained glass of the 13th century, famous because of a special cobalt blue colour, known as "the blue from Chartres". The north transept end commenced in 1280.

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