Carl Frederik Albert Christensen (16 January 1872 – 24 November 1942) was a Danish systematic botanist.
He graduated in natural history from the University of Copenhagen under professor Eugenius Warming.
He was then a school teacher in Copenhagen, and later superintendent at the Botanical Museum.
He was a specialist in ferns and published a catalogue of the World's Pteridophytes, Index Filicum.
In addition, he authored a three-volume work on the history of botany in Denmark.