Niedersayn
Municipality
Coat of arms
Location of Niedersayn within Westerwaldkreis district
Niedersayn Show map of Germany Niedersayn Show map of Rhineland-Palatinate
Coordinates: 50°31′49″N 7°49′55″E / 50.53028°N 7.83194°E / 50.53028; 7.83194
Country	Germany
State	Rhineland-Palatinate
District	Westerwaldkreis
Municipal assoc.	Wirges
Subdivisions	3
Government
• Mayor (2019–24)	Günter Anton Kober[1]
Area
• Total	2.82 km2 (1.09 sq mi)
Elevation	340 m (1,120 ft)
Population  (2022-12-31)[2]
• Total	180
• Density	64/km2 (170/sq mi)
Time zone	UTC+01:00 (CET)
• Summer (DST)	UTC+02:00 (CEST)
Postal codes	56244
Dialling codes	02602
Vehicle registration	WW
Website	www.niedersayn.de

Niedersayn is an Ortsgemeinde – a community belonging to a Verbandsgemeinde – in the Westerwaldkreis in Rhineland-Palatinate, Germany.

The community lies north of Montabaur on the river Sayn. Since 1971 it has belonged to what was then the newly founded Verbandsgemeinde of Wirges, a kind of collective municipality. Its seat is in the like-named town.

Niedersayn's Ortsteile are Karnhöfen, Blaumhöfen and Niedersayn.

In 1277, Niedersayn had its first documentary mention under the name Langesain.

The municipal council is made up of 7 council members, including the extraofficial mayor (Bürgermeister), who were elected in a majority vote in a municipal election on 13 June 2004.

East of the community runs Bundesstraße 255, linking Montabaur and Rennerod, and also Bundesstraße 8. The nearest Autobahn interchange is Montabaur on the A 3 (Cologne–Frankfurt), some 3 km away. The nearest InterCityExpress stop is the railway station at Montabaur on the Cologne-Frankfurt high-speed rail line.

• Niedersayn (in German)