狭带纪（Stenian，符号MP₃）是地质时代中的一个纪，开始于同位素年龄1200±0百万年(Ma)，结束于1000±0Ma。

狭带纪期间蓝藻、褐藻发育，出现大型宏观藻类。

狭带纪属于前寒武纪元古宙中元古代；狭带纪的上一纪为延展纪，下一纪为拉伸纪。

The Stenian (from Greek stenos, "narrow") is the final geologic period in the Mesoproterozoic Era and lasted from 1200 Mya to 1000 Mya (million years ago). Instead of being based on stratigraphy, these dates are defined chronometrically. The name derives from narrow polymetamorphic belts formed over this period.