| Image Coa: | Bornsen Wappen.png |
| Coordinates: | 53.4667°N 27°W |
| Image Plan: | Börnsen in RZ.svg |
| State: | Schleswig-Holstein |
| District: | Herzogtum Lauenburg |
| Amt: | Hohe Elbgeest |
| Elevation: | 48 |
| Area: | 8.42 |
| Postal Code: | 21039 |
| Area Code: | 040 |
| Licence: | RZ |
| Gemeindeschlüssel: | 01 0 53 012 |
| Website: | www.amt-hohe- elbgeest.de |
| Mayor: | Walter Heisch |
Börnsen is a municipality in the district of Lauenburg, in Schleswig-Holstein, Germany.