Pietro Mansueto Ferrari (28 July 1823, Novi Ligure – 15 June 1893, Crosio, 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