| Image Coa: | DEU Altenmoor COA.svg |
| Coordinates: | 53.7667°N 43°W |
| Image Plan: | Altenmoor in IZ.png |
| State: | Schleswig-Holstein |
| District: | Steinburg |
| Amt: | Horst-Herzhorn |
| Elevation: | 0 |
| Area: | 6.12 |
| Postal Code: | 25335 |
| Area Code: | 04121 |
| Licence: | IZ |
| Gemeindeschlüssel: | 01 0 61 004 |
| Website: | www.amt-horst-herzhorn.de |
| Mayor: | Wilfried Wulff |
Altenmoor is a municipality in the district of Steinburg, in Schleswig-Holstein, Germany.