Lestek (also Leszek, Lestko) was the second duke of Polans, and son of Siemowit, born c. 870–880, mentioned in the oldest Polish chronicle, Gesta principum Polonorum by Gallus Anonymus.

The issue was basically settled thanks to an article written by Henryk Łowmiański,[1] in which he came out in favor of the credibility of Gallus Anonymus's account, and thus in favor of the historicity of the three direct predecessors to Mieszko I.

The origin of his name is not known, but it can be derived from the old Polish word lście which means "crafty".

A theory by Stanisław Zakrzewski claims Lestek (or Lestko) could have been married to a Moravian princess.

Another theory (inferred from the descriptions of a Belgian chronicler from the 14th century) is that a Saxon princess could have been Lestek's wife and that they had a son, Ewraker, later the bishop of Liège.