Herzhorn was an Amt ("collective municipality") in the district of Steinburg, in Schleswig-Holstein, Germany. The seat of the Amt was in Herzhorn. In January 2008, it was merged with the Amt Horst to form the Amt Horst-Herzhorn.
The Amt Herzhorn consisted of the following municipalities:
- Blomesche Wildnis
- Borsfleth
- Engelbrechtsche Wildnis
- Herzhorn
- Kollmar
- Krempdorf
- Neuendorf bei Elmshorn
53°46′59″N 9°28′59″E / 53.783°N 9.483°E
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