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
- 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
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