| Coordinates: | 52.7167°N 13.6167°W |
| Image Plan: | Rüdnitz_in_BAR.png |
| State: | Brandenburg |
| District: | Barnim |
| Amt: | Biesenthal-Barnim |
| Elevation: | 61 |
| Area: | 13.79 |
| Postal Code: | 16321 |
| Area Code: | 03338 |
| Licence: | BAR |
| Gemeindeschlüssel: | 12 0 60 192 |
| Mayor: | Andreas Hoffmann[1] |
| Leader Term: | 2024 - 29 |
Rüdnitz is a municipality in the district of Barnim in the state of Brandenburg, Germany.
From 1815 to 1947, Rüdnitz was part of the Prussian Province of Brandenburg, from 1947 to 1952 of the State of Brandenburg, from 1952 to 1990 of the East German Bezirk Frankfurt and since 1990 again of Brandenburg.