Georges-Fernand-Isidor Widal; (born on March 9, 1862 in Dellys, Algeria and died in Paris on January 14, 1929) was a French physician.From 1886 to 1888 he devoted himself to public demonstrations of the researches of the faculty of pathological anatomy, and during the 2 years following was in charge of a course in bacteriology in the laboratory of Professor Victor André Cornil (1837-1908).