欧鲇（学名：Silurus glanis）又称欧洲巨鲇，为辐鳍鱼纲鲇形目鲇科的其中一种，是在欧洲生活的淡水鲇和汽水鲇。

欧鲇的体色各不相同，有的身体全黑，而有的头部则是深黄绿色或蓝黑色。欧鲇肋部颜色稍浅，还有极少数体表带有棕红色光泽；而其腹部是白色的。全身均为蓝黑色或白色的欧鲇个体也出现过。除了底色以外，欧鲇的身上还有云片状或点状的花纹。鳍色为深棕红色或紫褐色。

欧鲇的体色主要会随着水的清澈程度而受影响，生活在混浊水域中欧鲇体色是褐色，而生活在清澈水域中欧鲇体色则是偏向黑色，此外，季节也会影响欧鲇的体色。

The wels catfish (/ˈwɛls/ or /ˈvɛls/; Silurus glanis), also called sheatfish, is a large catfish native to wide areas of central, southern, and eastern Europe, in the basins of the Baltic, Black, and Caspian Seas. It has been introduced to Western Europe and is now found from the United Kingdom all the way east to Kazakhstan and south to Greece and Turkey. It is a scaleless freshwater fish recognizable by its broad, flat head and wide mouth. Wels catfish can live for at least fifty years and have very good hearing.