| Harmsdorf | |
| Image Coa: | DEU Harmsdorf (Lauenburg) COA.svg |
| Coordinates: | 53.7022°N 10.7264°W |
| Image Plan: | Harmsdorf in RZ.svg |
| State: | Schleswig-Holstein |
| District: | Herzogtum Lauenburg |
| Amt: | Lauenburgische Seen |
| Elevation: | 32 |
| Area: | 3.57 |
| Postal Code: | 23911 |
| Area Code: | 04541 |
| Licence: | RZ |
| Gemeindeschlüssel: | 01 0 53 051 |
| Website: | www.amt-lauenburgische-seen.de |
| Mayor: | Hans-Heinrich Mahnke |
Harmsdorf is a municipality in the district of Lauenburg, in Schleswig-Holstein, Germany.