Following is the list of Top 10 Largest Church Buildings By Area as per Catholic Encyclopedia:
| S.No. | Name | Country |
Area
(in meter square)
|
| 1 | St. Peter's Basilica | Vatican City | 20,139 (interior 15,160) |
| 2 | Basilica of the National Shrine of Our Lady of Aparecida | Brazil | >12,000 |
| 3 | Seville Cathedral | Spain | 11,520 |
| 4 | Cathedral of Saint John the Divine | United States | 11,200 |
| 5 | Milan Cathedral | Italy | 10,186 |
| 6 | Basilica of Our Lady of Lichen | Poland | 10,090 |
| 7 | Liverpool Cathedral | United Kingdom | 9,687 |
| 8 | Church of the Most Holy Trinity | Portugal | 8,700 |
| 9 | Basilica- Cathedral of Our Lady of the Pillar | Spain | 8,318 |
| 10 | Cathedral of Saint Sava | Serbia | 8,162 |
