The Basilica Cathedral of St. Cecilia <small>(Basilique-Cathédrale Sainte-Cécile in French)</small> is a Roman Catholic minor basilica and a cathedral dedicated to St. Cecilia located in Salaberry-de-Valleyfield, Quebec, Canada. The basilica is under the circumscription of the Roman Catholic Diocese of Valleyfield. The basilica was decreed on February 9, 1991.