| Image Coa: | DEU Osterhorn COA.svg |
| Coordinates: | 53.8692°N 9.6981°W |
| Image Plan: | Osterhorn in PI.svg |
| State: | Schleswig-Holstein |
| District: | Pinneberg |
| Amt: | Hörnerkirchen |
| Elevation: | 9 |
| Area: | 6.38 |
| Postal Code: | 25364 |
| Area Code: | 04127 |
| Licence: | PI |
| Gemeindeschlüssel: | 01 0 56 038 |
| Website: | www.amt- hoernerkirchen.de |
| Mayor: | Ralf Henning |
Osterhorn is a municipality in the district of Pinneberg, in Schleswig-Holstein, Germany.