| Horst | |
| Image Coa: | DEU Horst (Holstein) COA.svg |
| Coordinates: | 53.8111°N 9.6183°W |
| Image Plan: | Horst in IZ.png |
| State: | Schleswig-Holstein |
| District: | Steinburg |
| Amt: | Horst-Herzhorn |
| Elevation: | 15 |
| Area: | 29.07 |
| Postal Code: | 25358 |
| Area Code: | 04121, 04126 |
| Licence: | IZ |
| Gemeindeschlüssel: | 01 0 61 044 |
| Website: | www.amt-horst-herzhorn.de |
| Mayor: | Joern Ploeger |
Horst is a municipality in the district of Steinburg, in Schleswig-Holstein, Germany. It is situated approximately 14 km southeast of Itzehoe, and 7 km northwest of Elmshorn.
Horst is the seat of the Amt ("collective municipality") Horst-Herzhorn.