The Lude is an 7.0-kilometre (4.3 mi) long stream of Saxony-Anhalt, in the Harz Mountains of central Germany.

It is the strongest and – besides an affluent of itself – longest headwater of the Thyra and therefore hydrographically defined as its upper course.

The Lude rises northwest of Stolberg, about one kilometre west of Breitenstein.

The stream is considerably longer than the Hellbach, has a significantly greater catchment area, its own tributaries and is impounded in its lower reaches.

[1] The Thyra then continues through Stolberg flowing in a southerly direction.