| Harmsdorf | |
| Image Coa: | DEU Harmsdorf (Ostholstein) COA.svg |
| Coordinates: | 54.25°N 59°W |
| Image Plan: | Harmsdorf in OH.png |
| State: | Schleswig-Holstein |
| District: | Ostholstein |
| Amt: | Lensahn |
| Elevation: | 29 |
| Area: | 17.82 |
| Postal Code: | 23738 |
| Area Code: | 04363 |
| Licence: | OH |
| Gemeindeschlüssel: | 01 0 55 020 |
| Website: | www.lensahn.de |
| Mayor: | Reinhard Schöning |
Harmsdorf is a municipality in the district of Ostholstein, in Schleswig-Holstein, Germany.