| Coordinates: | 53.7906°N 9.4842°W |
| Image Plan: | Herzhorn in IZ.png |
| State: | Schleswig-Holstein |
| District: | Steinburg |
| Amt: | Horst-Herzhorn |
| Elevation: | 1 |
| Area: | 12.43 |
| Postal Code: | 25379 |
| Area Code: | 04124, 04128 |
| Licence: | IZ |
| Gemeindeschlüssel: | 01 0 61 037 |
| Website: | www.amt-horst-herzhorn.de |
| Mayor: | Wolfgang Glißmann |
Herzhorn is a municipality in the district of Steinburg, in Schleswig-Holstein, Germany. It is situated near the river Elbe, approx. 4 km east of Glückstadt, and 15 km south of Itzehoe.
Herzhorn was the seat of the former Amt ("collective municipality") Herzhorn.