| Kastl | |
| Image Coa: | DEU Kastl-Obb COA.svg |
| Coordinates: | 48.2°N 54°W |
| Image Plan: | Kastl in AÖ.svg |
| State: | Bayern |
| Region: | Oberbayern |
| District: | Altötting |
| Verwaltungsgemeinschaft: | Unterneukirchen |
| Elevation: | 437 |
| Area: | 27.36 |
| Postal Code: | 84556 |
| Area Code: | 08671 |
| Licence: | AÖ |
| Gemeindeschlüssel: | 09 1 71 121 |
| Website: | www.kastl-obb.de |
| Mayor: | Gottfried Mitterer[1] |
| Leader Term: | 2020 - 26 |
| Party: | FW |
Kastl is a municipality in the district of Altötting in Bavaria in Germany. It is the result of a merger of Oberkastl, Unterkastl, and Forstkastl in the 1960s.