Old Cathedral may refer to:

A colloquial name for the Basilica of St. Louis, King of France Old Cathedral, Brescia, Italy Old Cathedral of Coimbra, Portugal Old Cathedral of Cuenca, Ecuador Old Cathedral of Managua, Nicaragua Old Cathedral of Rio de Janeiro Old Cathedral, Salamanca, Spain Old Saint Mary's Cathedral, California, US St. Francis Xavier Cathedral and Library, locally known as the Old Cathedral, Indiana, US