Roman Catholic Diocese of Basel
| Diocese of Basel Diœcesis Basileensis Bistum Basel | |
|---|---|
| Solothurn Cathedral, the seat of the diocese | |
| Coat of arms | |
| Location | |
| Country | Switzerland | 
| Territory | Aargau, Basel-Landschaft, Basel-Stadt, Bern, Jura, Lucerne, Schaffhausen, Solothurn, Thurgau, and Zug | 
| Metropolitan | Immediately subject to the Holy See | 
| Statistics | |
| Area | 12,585 km2 (4,859 sq mi) | 
| Population 
 
 | 
 
 
 | 
| Parishes | 483 | 
| Information | |
| Denomination | Catholic | 
| Sui iuris church | Latin Church | 
| Rite | Roman Rite | 
| Established | 740 (As Diocese of Basel) 7 September 1888 (As Diocese of Basel e Lugano) 8 March 1971 (As Diocese of Basel) | 
| Cathedral | St. Ursus Cathedral, Solothurn | 
| Secular priests | 675 | 
| Current leadership | |
| Pope | Leo XIV | 
| Bishop | Felix Gmür | 
| Bishops emeritus | Hansjörg Vogel Denis Theurillat Martin Gächter | 
| Map | |
| Map of the modern diocese of Basel within Switzerland | |
| Website | |
| bistum-basel.ch | |
The Diocese of Basel (German: Bistum Basel; Latin: Diœcesis Basileensis) is a Latin Catholic diocese in Switzerland.
Historically, the bishops of Basel were also secular rulers of the Prince-Bishopric of Basel (German: Fürstbistum Basel). Today the diocese of Basel includes the Swiss cantons of Aargau, Basel-Landschaft, Basel-Stadt, Bern, Jura, Lucerne, Schaffhausen, Solothurn, Thurgau, and Zug.