Léon Marc Herminie Fairmaire (1820 - 1 April 1906) was a French entomologist.
A specialist in Coleoptera he assembled an immense collection comparable with that of Pierre François Marie Auguste Dejean (1780-1845). This is in the Muséum national d'histoire naturelle. Faimaire wrote 450 scientific papers and other publications relating to Coleoptera.He also worked on Hemiptera