Leonello is a given name. Notable people with the name include:
Leonello Casucci (1885–1975), Italian composer Leonello d'Este (1407–1450), Marquess of Ferrara, Modena, and Reggio Emilia Leonello Picco (1876–1921), Italian entomologist Leonello Rabatti (born 1960), Italian poet and critic Leonello Spada (also called Lionello Spada) (1576–1622), Italian painter Leonello Tarabella (born 1948), Italian researcher, musician and composer