Catharina Helena Dörrien (1 March 1717, in Hildesheim – 8 June 1795, in Dillenburg) was a German botanist and teacher, recognized as "the most celebrated German-speaking female naturalist of the period". She was a talented artist who painted over 1,400 watercolor botanical illustrations, and published a catalogue of plants of the Principality of Orange-Nassau in 1777. She was also the first woman to name a fungal taxon.