Metropolitan Basilica Cathedral of the Immaculate Conception and San Felipe and Santiago, Roman Catholic cathedral in Ciudad Vieja, Uruguay.

The Metropolitan Basilica Cathedral of the Immaculate Conception and San Felipe and Santiago faces Constitution Square in Ciudad Vieja. Its neoclassical design is attributed to Tomás Toribio, with later work by Bernardo Poncini giving it its current appearance. Inside are a main altar, side altars, and tombs of figures such as Fructuoso Rivera and Juan Antonio Lavalleja.

Construction started in 1790 to replace an earlier brick church from 1740, and the building was officially consecrated in 1804. The structure evolved during the 19th century and became the spiritual center of the developing city.

The cathedral is dedicated to the Immaculate Conception and to Montevideo's patron saints, Philip and James. On a side altar stands the venerated image of the Virgin of the Thirty-Three, patron saint of Uruguay. The musical piece La Catedral by Agustín Barrios was inspired by this building, and choral concerts and weddings are held inside.

The cathedral faces Constitution Square in Ciudad Vieja, opposite the Cabildo, so it is easy to find on foot from the old town's main square. It is an active parish church with regular services, weddings and choral concerts, so visits may coincide with ceremonies. As a National Historic Monument since 1975, it draws both worshippers and sightseers.

A side altar holds an image of the Virgin of the Thirty-Three, the patron saint of Uruguay, whom many visitors acknowledge in prayer as they pass by. This representation holds special meaning for those seeking spiritual help or giving thanks.