Rehlingen-Siersburg is a municipality in the district of Saarlouis, in Saarland, Germany.

It is situated on the river Saar, approx.

Rehlingen is located at the Saar, Siersburg is located at the Nied, the other districts are partly on the Gau (Saargau), partly in the valley of the Nied, a left-side tributary of the Saar.

Rehlingen-Siersburg borders France to the west, Merzig-Wadern district to the north, Dillingen / Saar to the east, and Wallerfangen to the south.

This Saarland location article is a stub.