绵毛水苏（学名：Stachys lanata）为唇形科水苏属下的一个种。

Stachys byzantina (syn. S. lanata; lamb's-ear or woolly hedgenettle) is a species of Stachys, native to Turkey, Armenia, and Iran. It is cultivated over much of the temperate world as an ornamental plant, and is naturalised in some locations as an escapee from gardens. Plants are very often found under the synonym Stachys lanata or Stachys olympica.