French author and journalist, known as the creator of Arsène Lupin, French gentleman-thief turned detective, who is featured in more than 60 of Leblanc's crime novels and short stories.

Leblanc abandoned his law studies to become a pulp crime writer. Commissioned in 1905 to write a crime story for the French periodical Je sais tout, he created “L'Arrestation d'Arsène Lupin” (“The Arrest of Arsène Lupin”) and achieved immediate and long-lasting popular success. His first collection of short stories appeared in 1907. Leblanc used as a recurrent element the suspicion that Lupin may not have reformed completely. Many of Leblanc's stories were adapted into successful films in the 1930s.

Leblanc was awarded the French Legion of Honour.