Castagna may refer to:
People Andrea del Castagno (c.1419–1457), Italian painter Armando Castagna, Italian speedway rider Cacho Castagna (1942–2019), Argentine musician Cristina Castagna (1977–2009), Italian mountaineer Domingo Salvador Castagna (born 1931), Argentine Roman Catholic archbishop Filippo Castagna (1765–1830), Maltese politician John Castagna, American geophysicist Michele Paco Castagna, Italian speedway rider William J. Castagna (1924–2020), American jurist
Companies Carrozzeria Castagna, an Italian coachbuilding company from Milan Places Castagna, Catanzaro, a town in the Calabria region of southern Italy Castel Castagna, a town in the Abruzzo region of central Italy Castagna (restaurant), a restaurant in Portland, Oregon, United States