| Largest Churches This list is not exhaustive. | ||
| 1 |  |  Basilica Papale di San Pietro in Vaticano  Papal Basilica of St. Peter in the Vatican (Vatican Basilica) (15,160 m²) |
| 2 |  Aparecida, São Paulo |  Catedral Basílica Santuário Nacional de Nossa Senhora da Conceição Aparecida Cathedral Basilica and National Shrine of Our Lady of Aparecida (12,000 m²) |
| 3 |  Sevilla, Sevilla, Andalucía |  Catedral de Santa María de la Sede Cathedral of St. Mary (11,520 m²) |
| 4 |  New York, New York |  Cathedral Church of St. John the Divine (Episcopal) (11,200 m²) |
| 5 |  Milano, Milano, Lombardia | Cattedrale di Santa Maria Nascente (Ambrosian Rite) Parrocchia Santa Tecla Cathedral of the Nativity of St. Mary Parish of St. Tecla (10,186 m²) |
| 6 |  Licheń Stary, Wielkopolskie |  Bazylika MB Bolesnej Królowej Polski Sanktuarium maryjne Basilica of Our Lady Queen of Poland (10,090 m²) |
| 7 |  Liverpool, Liverpool | Liverpool Cathedral (Anglican) (9,687 m²) |
| 8 |  Fátima, Santarém | Basílica de la Santíssima Trindade Basilica of the Most Holy Trinity (8,700 m²) |
| 9 | Zaragoza, Zaragoza, Aragón |  Catedral Basílica de Nuestra Señora del Pilar Cathedral Basilica of Our Lady of the Pillar (8,318 m²) |
| 10 |  Ulm, Baden-Württemberg | Ulmer Münster (Lutheran) (8,260 m²) |
| 11 |  Belgrade, Beograd |  Cathedral of Saint Sava (Serbian Orthodox) (8,162 m²) |
| 12 |  Koekelberg, Bruxelles-Capitale |  Basilique Nationale du Sacré-Cœur Nationale Heilig Hartbasiliek National Basilica of the Sacred Heart (8,000 m²) |
| 13 |  Ciudad de México, Ciudad de México | Insigne y Nacional Basílica de Santa María de Guadalupe National Basilica of Our Lady of Guadalupe (8,000 m²) |
| 14 | Antwerpen, Antwerpen, Vlaanderen | Onze-Lieve-Vrouwekathedraal Cathédrale Notre-Dame Cathedral of Our Lady (8,000 m²) |
| 15 |  Yamoussoukro, Yamoussoukro | Basilique Notre-Dame de la Paix Basilica of Our Lady of Peace (7,989 m²) |
| 16 |  Istanbul |  Hagia Sophia Cathedral of the Holy Wisdom (7,960 m²) |
| 17 | Bologna, Bologna, Emilia Romagna | Basilica di San Petronio Basilica of St. Petronius (7,920 m²) |
| 18 | Köln, Nordrhein-Westfalen | Dom St. Peter und Maria Cathedral of Sts. Peter and Mary (7,914 m²) |
| 19 | London, City of London | St Paul’s Cathedral (Anglican) (7,875 m²) |
| 20 | Washington, District of Columbia | Washington National Cathedral (Episcopal) (7,712 m²) |
| 21 |  Amiens, Somme, Hauts-de-France | Basilique-Cathédrale Notre-Dame Cathedral Basilica of Our Lady (7,700 m²) |
| 22 | Washington, District of Columbia | Basilica of the National Shrine of the Immaculate Conception (7,097 m²) |
| 23 |  Montréal, Québec | Basilique de Saint-Joseph du Mont-Royal Basilica of St. Joseph of Mount Royal (6,825 m²) |
| 24 | Barcelona, Barcelona, Catalunya | Basílica i Temple Expiatori de la Sagrada Família Basílica y Templo Expiatorio de la Sagrada Familia Basilica and Expiatory Church of the Holy Family (5,400 m²) |
| 25 | Winchester, Hampshire | Winchester Cathedral (Anglican) (4,968 m²) |
| 26 |  Taal, Batangas, Calabarzon | Basilica of St. Martin de Tours (4,320 m²) |
| 27 | Cambridgeshire, Cambridgeshire | Ely Cathedral (Anglican) (4,273 m²) |
