Carl Friedrich Warnstorf was a German educator and bryologist specializing in sphagnum studies.
He received his education at the teaching seminar in Neuzelle, afterwards working as a school teacher in Arnswalde and Neuruppin. Following retirement from teaching he settled in Berlin. In 1917 he was awarded with the title of professor. During World War II his herbarium of 30,000 items was destroyed in the midst of the bombing of Berlin.
The genus Warnstorfia was named in his honor by bryologist Leopold Loeske.