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.

The bishops of Basel have not resided in the city of Basel since 1528. Solothurn is the seat of the Bishop.

• Jakob Christoph Blarer von Wartensee (1576–1608)
• Wilhelm Rinck von Balderstein (1609–1628)
• Johann Heinrich von Ostein (1629–1646)
• Beat Albrecht von Ramstein (1646–1651)
• Johann Franz Reichsritter von Schönau (1651–1656)
• Johann Konrad von Roggenbach (1657–1693)
• Wilhelm Jakob Rink von Baldenstein (1693–1705)
• Johann Konrad Reichsfreiherr von Reinach-Hirzbach (1705–1737)
• Jakob Sigismund von Reinach-Steinbrunn (1737–1743)
• Josef Wilhelm Rinck von Baldenstein (1744–1762)
• Simon Nikolaus Euseb Reichsgraf von Montjoye-Hirsingen (1762–1775)
• Friedrich Ludwig Franz Reichsfreiherr von Wangen zu Geroldseck (1775–1782)
• Franz Joseph Sigismund von Roggenbach (1782–1792)
• Franz Xaver Freiherr von Neveu (1792–1828)
• Josef Anton Salzmann (1828–1854)
• Karl Arnold-Obrist (1854–1862)
• Eugène Lachat C.Pp.S. (1863–1884)
• Friedrich Xaver Odo Fiala (1885–1888)
• Leonhard Haas (1888–1906)
• Jakobus von Stammler (1906–1925)
• Joseph Ambühl (1925–1936)
• Franz von Streng (1936–1967)
• Anton Hänggi (1967–1982)
• Otto Wüst (1982–1993)
• Hansjörg Vogel (1994–1995)
• Kurt Koch (1995–2010)
• Felix Gmür (2010– )

• Bistum Basel (in German and French)