| Image Coa: | DEU Janneby COA.svg |
| Coordinates: | 54.6167°N 27°W |
| Image Plan: | Janneby in SL.PNG |
| State: | Schleswig-Holstein |
| District: | Schleswig-Flensburg |
| Amt: | Eggebek |
| Elevation: | 17 |
| Area: | 14.49 |
| Postal Code: | 24992 |
| Area Code: | 04607 |
| Licence: | SL |
| Gemeindeschlüssel: | 01 0 59 128 |
| Divisions: | 3 Ortsteile |
| Website: | www.amt-eggebek.de |
| Mayor: | Ute Richter |
Janneby is a municipality in the district of Schleswig-Flensburg, in Schleswig-Holstein, Germany.