Rouen Cathedral is a Catholic church in Rouen, Normandy, France. It is the see of the Archbishop of Rouen, Primate of Normandy. It is famous for its three towers, each in a different style. The cathedral, built and rebuilt over a period of more than eight hundred years, has features from Early Gothic to late Flamboyant and Renaissance architecture. It also has a place in art history as the subject of a series of impressionist paintings by Claude Monet, and in architecture history as from 1876 to 1880, it was the tallest building in the world.

Rouen is a city on the River Seine in northern France. It is the prefecture of the region of Normandy and the department of Seine-Maritime. Formerly one of the largest and most prosperous cities of medieval Europe, the population of the metropolitan area is 702,945 (2018). People from Rouen are known as Rouennais.