| Nieby Nyby | |
| Image Coa: | DEU Nieby COA.svg |
| Coordinates: | 54.7667°N 64°W |
| Image Plan: | Nieby in SL.PNG |
| State: | Schleswig-Holstein |
| District: | Schleswig-Flensburg |
| Amt: | Geltinger Bucht |
| Elevation: | 9 |
| Area: | 8.07 |
| Postal Code: | 24395 |
| Area Code: | 04643 |
| Licence: | SL |
| Gemeindeschlüssel: | 01 0 59 147 |
| Mayor: | Dirk Hansen[1] |
Nieby (pronounced as /de/, Danish: '''Nyby''') is a municipality in the district of Schleswig-Flensburg, in Schleswig-Holstein, Germany.