Beauvais Cathedral or at greater length the Cathedral of Saint Peter of Beauvais is a Roman Catholic church in the northern town of Beauvais, Oise, France. It is the seat of the Bishop of Beauvais, Noyon and Senlis.

Construction was begun in the 13th century. The cathedral is in the Gothic style. It consists only of a transept (16th century) and choir, with an apse and seven polygonal apsidal chapels (13th century), which are reached by an ambulatory. A small Romanesque church dating back to the 10th century, known as the Basse Œuvre, still occupies the site destined for the nave of Beauvais Cathedral. Several of the chapels contain medieval stained glass windows made during the 13th through to the 15th centuries. In a chapel close to the northern entrance, there is a medieval clock (14th – 15th century), possibly the oldest fully preserved and functioning mechanical clock in Europe. In its vicinity, the highly complicated Beauvais Astronomical clock with moving figures was installed in 1866.