| Coordinates: | 52.1167°N 50°W |
| Image Plan: | Remlingen-Semmenstedt in WF.svg |
| State: | Niedersachsen |
| District: | Wolfenbüttel |
| Samtgemeinde: | Elm-Asse |
| Elevation: | 138 |
| Area: | 33.30 |
| Postal Code: | 38319, 38327 |
| Area Code: | 05336 |
| Licence: | WF |
| Gemeindeschlüssel: | 03 1 58 040 |
Remlingen-Semmenstedt is a municipality in the district of Wolfenbüttel, in Lower Saxony, Germany. It was formed on 1 November 2016 by the merger of the former municipalities Remlingen and Semmenstedt.
Five villages belong to the municipality (population 2022):