Franz Julius Ferdinand Meyen (28 June 1804 – 2 September 1840) was a Prussian physician and botanist.
In 1830 he wrote Phytotomie, the first major study of plant anatomy.
Between 1830 and 1832, he took part in an expedition to South America on board the Prinzess Luise, visiting Peru and Bolivia, describing species then new to science such as the Humboldt penguin.
With Heinrich Friedrich Link, he was co-editor of the journal Jahresberichte über die Arbeiten für physiologische Botanik (1837–1839).
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