Pietro Mansueto Ferrari (28 July 1823, Novi Ligure – 15 June 1893, , Alessandria) was an Italian entomologist who specialised in Hemiptera, particularly Auchenorrhyncha. He is not to be confused with Johann Angelo Ferrari also an entomologist. Pietro Ferrari was a physician. He wrote: and many other works describing new species. His collection including all his types is conserved in the Museo Civico di Storia Naturale di Genova