Helga Dietrich (1940–2018) was a German orchidologist and author who is noted for her comprehensive guides to literature on orchids, and for her work as curator of the Botanischer Garten Jena.
Dietrich studied biology at the University of Jena from 1959 and graduated in 1964 with a diploma on the topic The Pollen Morphology of the Plantaginaceae.
After receiving her doctorate in 1975, she was appointed curator of the Jena Botanical Garden.
Her dissertation was on the subject of On the Trait Inventory of the Plantaginaceae and its Significance for Systematics.
In 1980 she received the teaching qualification, between 1989 and 1994 she completed a PhD-B procedure, which was recognized as habilitation a short time later.