| Altdorf | |
| Image Coa: | Altdorf Lower Bavaria coat of arms.svg |
| Coordinates: | 48.5667°N 19°W |
| Image Plan: | Altdorf in LA.svg |
| State: | Bayern |
| Region: | Niederbayern |
| District: | Landshut |
| Elevation: | 396 |
| Area: | 23.05 |
| Postal Code: | 84032 |
| Area Code: | 0871 |
| Licence: | LA |
| Gemeindeschlüssel: | 09 2 74 113 |
| Website: | www.markt-altdorf.de |
| Mayor: | Sebastian Stanglmaier[1] |
| Leader Term: | 2020 - 26 |
Altdorf is a market town and municipality in the district of Landshut, in Bavaria, Germany. It is situated 4 km northwest of Landshut.