François Gagnepain (23 September 1866 – 25 January 1952) was a French botanist.

The standard botanical author abbreviation Gagnep.

[1] With Achille Eugène Finet, he named a number of species within the botanical family Annonaceae.

[2] The genus Gagnepainia (family Zingiberaceae) was named in his honor by Karl Moritz Schumann.

[3] The French Academy of Sciences awarded Gagnepain the Prix de Coincy for the year 1907.