Frederik Marcus Knuth may refer to:
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Frederik Marcus Knuth (politician) (1813–1856), 5th Count of Knuthenborg, Danish aristocrat, civil servant and politician, first Minister of Foreign Affairs of Denmark
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Frederik Marcus Knuth (taxonomist)
Frederik Marcus Knuth, 9th Count of Knuthenborg (5 May 1904 – 14 June 1970) was a Danish taxonomist especially known for the collection and classification of cactus
A cactus (: cacti, cactuses, or less commonly, cactus) is a member of the ...
(1904–1970), 9th Count of Knuthenborg, Danish taxonomist
{{hndis, Knuth, Frederik Marcus