Roman Catholic Diocese of Basel

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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 - Total - Catholics	(as of 2022) 3,462,119 1,010,839 (29.2%)
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	Francis
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).

The bishop of Basel has not resided in the city of Basel since 1528. Solothurn is the seat of the Bishop of Basel.

Today the diocese of Basel includes the Swiss cantons of Aargau, Basel-Landschaft, Basel-Stadt, Bern, Jura, Lucerne, Schaffhausen, Solothurn, Thurgau, and Zug.