| Castellalto | |
| Official Name: | Comune di Castellalto |
| Coordinates: | 42.6771°N 13.8178°W |
| Province: | (TE) |
| Frazioni: | Casemolino, Castelbasso, Castelnuovo Vomano, Feudo, Fosso Cupo, Guzzano, Mulano, Petriccione, San Cipriano, San Gervasio, Santa Lucia, Villa Torre, Villa Zaccheo |
| Area Total Km2: | 33 |
| Population Footnotes: | [1] |
| Population Total: | 7231 |
| Population As Of: | 1 January 2007 |
| Population Demonym: | Castellaltesi |
| Elevation M: | 492 |
| Postal Code: | 64020 |
| Area Code: | 0861 |
| Istat: | 067011 |
| Fractions: | Bellante, Canzano, Cellino Attanasio, Cermignano, Mosciano Sant'Angelo, Notaresco, Teramo |
| Fiscal Code: | C128 |
Castellalto is a town and comune in Teramo province in the Abruzzo region of eastern Italy.