Marie Jules César Lelorgne de Savigny (French: [maʁi ʒyl sezaʁ ləlɔʁɲ də saviɲi]; 5 April 1777 – 5 October 1851) was a French zoologist. Savigny was born at Provins. In 1798 he travelled to Egypt with the Emperor Napoleon as part of the French scientific expedition to that country, and contributed to the publication of the findings of the expedition in 1809 (Description de l'Égypte; published more fully in 1822). He wrote about the fauna in the Mediterranean Sea and the Red Sea. He is also known for proposing a theory that the mouth-parts of insects are homologous with locomotory organs (e.g. legs).