Marcel Allain (15 September 1885 – 25 August 1969) was a French writer mostly remembered today for his co-creation with Pierre Souvestre of the fictional arch-villain and master criminal Fantômas.
The son of a Parisian bourgeois family, Allain studied law before becoming a journalist.
He then became the assistant of Souvestre, who was already a well-known figure in literary circles.
In 1909, the two men published their first novel, Le Rour.
Investigating Magistrate Germain Fuselier, later to become a recurring character in the FantĂ´mas series, appears in the novel.
Then, in February 1911, Allain and Souvestre embarked upon the Fantômas book series at the request of publisher Arthème Fayard, who wanted to create a new monthly pulp magazine.