Ailertchen (formerly Elbörtchen) is an Ortsgemeinde – a community belonging to a Verbandsgemeinde – in the Westerwaldkreis in Rhineland-Palatinate, Germany.

Since 1972 it has belonged to what was then the newly founded Verbandsgemeinde of Westerburg, a kind of collective municipality.

Ailertchen lies 6 km northwest of Westerburg on a broad plain.

Running straight through the community is the Bundesstraße 255 leading from Montabaur to Herborn.

The nearest InterCityExpress stop is the railway station at Montabaur on the Cologne-Frankfurt high-speed rail line.