Sierck-les-Bains
Commune
The western part of Sierck-les-Bains
Coat of arms
Location of Sierck-les-Bains
Sierck-les-Bains Show map of France Sierck-les-Bains Show map of Grand Est
Coordinates: 49°26′35″N 6°21′39″E / 49.4431°N 6.3608°E / 49.4431; 6.3608
Country	France
Region	Grand Est
Department	Moselle
Arrondissement	Thionville
Canton	Bouzonville
Intercommunality	Bouzonvillois-Trois Frontières
Government
• Mayor (2020–2026)	Helen Lambard-Hammond[1]
Area 1	4.8 km2 (1.9 sq mi)
Population  (2021)[2]	1,772
• Density	370/km2 (960/sq mi)
Time zone	UTC+01:00 (CET)
• Summer (DST)	UTC+02:00 (CEST)
INSEE/Postal code	57650 /57480
Elevation	145–337 m (476–1,106 ft)
1 French Land Register data, which excludes lakes, ponds, glaciers > 1 km2 (0.386 sq mi or 247 acres) and river estuaries.

Sierck-les-Bains (German: Bad Sierck, Lorraine Franconian: Siirk/Siirck) is a commune in the Moselle department in Grand Est in north-eastern France. Localities of the commune: Rudling, Kœnigsberg (German: Rudlingen, Königsberg)

Language Revitalization

Sierck-Les-Bains and other municipalities in the Moselle Department of France have attempted some limited projects to protect and revitalize the declining Lorraine-Franconian dialects which were historically spoken in the region.^[3] The dialect historically spoken in Sierck is closely related to the Saarländisch dialects and Luxembourgish due to the village’s proximity to the German and Luxembourg borders. Sierck has put up road signs with the Lorraine Franconian name “Siirk” as well as street names in Lorraine Franconian. Such attempts to revitalize the Lorraine Franconian language has also been replicated in other municipalities in the Moselle department such as Hettange-Grande.