Nello Beccari (11 January 1883 – 20 March 1957) was an Italian professor of comparative and human anatomy.
He studied medicine and surgery at the institute of human anatomy in Florence under Giulio Chiarugi.
In 1931 he went on a collecting expedition to British Guyana, and numerous arthropod specimens were obtained.
Beccari became interested in the origin of germ cells in vertebrates and conducted histological studies.
Emanuele Padoa, Mario Galgano, and Valdo Mazzi were his students and assistants.