Antoine-Fortuné Marion (10 October 1846 – 22 January 1900) was a French naturalist with interests in geology, zoology, and botany.

A school friend of Paul Cézanne's in Aix-en-Provence, Marion went on to become professor and director of the Natural History Museum in Marseille.

[1] He was a good friend of Gaston de Saporta, with whom he collaborated on works in the field of botany.

As a zoologist, his research included studies of segmented marine worms, free-living roundworms of the Mediterranean, nemerteans, rotifers, zoantharians, alcyonarians, parasites that affected crustaceans and investigations of the class Enteropneusta.

As a result of his work in the fight against Phylloxera (an aphid-like pest), he was given awards by the French and foreign governments.