Amedeo John Engel Terzi (1872, Palermo -1956) was an Italian illustrator and entomologist specialising in Diptera, the true flies. He was the son of Andrea Terzi (1852-1918), a lithographer and illustrator. His brother, Aleardo Terzi (1870–1943), was also an artist; he worked on poster advertising. In 1900, Terzi worked with Louis Sambon and George Carmichael Low on mosquitoes transmitting malaria at Ostia. In 1902 he joined the Natural History Museum.