Paolo Magretti (15 December 1854, Milan – 30 August 1913, Paderno Dugnano) was an Italian entomologist who specialized in Hymenoptera studies. He studied zoology under Leopoldo Maggi and at the University of Pavia, graduating in 1880 with a thesis on Hymenoptera found in Lombardy. In 1883 he undertook a zoological expedition to eastern Sudan and Eritrea, in which he collected a number of Hymenoptera species new to science. In 1900, he returned to Eritrea, where he spent two months collecting more zoological specimens.