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".

[1][2] 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.

[4] Dörrien left Hildesheim and started working as a governess in Dillenburg for her childhood friend Sophie Anna Blandina (née von Alers) in 1746, when she was 30.

[4] Dörrien initially painted for pleasure, but was encouraged by Sophie's husband, Anton Ulrich von Erath, to create an illustrated flora of the principality of Orange-Nassau.

[4] Dörrien produced the catalogue in 1777, being one of the first Germans to use the Linnean system of classification.