| Castelbottaccio | |
| Official Name: | Comune di Castelbottaccio |
| Coordinates: | 41.75°N 56°W |
| Region: | Molise |
| Province: | Campobasso (CB) |
| Mayor: | Mario Disertore |
| Area Total Km2: | 11.22 |
| Population Footnotes: | It is the home of writer Roger Lewis. |
| Population Total: | 274 |
| Population As Of: | 30 November 2017[1] |
| Population Demonym: | Castelbottaccesi |
| Elevation M: | 618 |
| Saint: | St Otho |
| Day: | 31 July |
| Postal Code: | 86030 |
| Area Code: | 0874 |
Castelbottaccio is a comune (municipality) in the Province of Campobasso in the Italian region Molise, located about 20km (10miles) north of Campobasso as the crow flies but 36 kilometres by road.
Castelbottaccio borders the following municipalities: Civitacampomarano, Lucito, Lupara, and Morrone del Sannio.