Claude Casimir Gillet (19 May 1806 in Dormans, department of Marne – 1 September 1896 in Alençon), was a French botanist and mycologist. He initially trained as a medical doctor and veterinarian. As a veterinarian, he worked for four years in Africa. Around 1853 he developed a passion for mycology, subsequently publishing a number of works on the subject. In 1867 he became a corresponding member of the Société Linnéenne de Normandie. Gillet was the taxonomic authority of the genera Tubaria (initially named a subgenus of Agaricus by Worthington George Smith) and Microglossum. He was honoured in 1899, when botanists P.A.Saccardo & P.Sydow published Gilletiella, which is a genus of fungi in the class Dothideomycetes.

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