| Altenmarkt a.d.Alz | |
| Image Coa: | Wappen von Altenmarkt (Alz).svg |
| Coordinates: | 48°N 43°W |
| Image Plan: | Altenmarkt an der Alz in TS.svg |
| State: | Bavaria |
| Region: | Oberbayern |
| District: | Traunstein |
| Elevation: | 499 |
| Area: | 26.10 |
| Postal Code: | 83352 |
| Area Code: | 08621 |
| Licence: | TS |
| Gemeindeschlüssel: | 09 1 89 111 |
| Website: | www.altenmarkt.de |
| Mayor: | Stephan Bierschneider[1] |
| Leader Term: | 2020 - 26 |
| Party: | CSU |
Altenmarkt an der Alz is a municipality in the district of Traunstein in Bavaria, Germany.