Unterriexingen is a village in the district of Ludwigsburg, Baden-Württemberg, Germany.

Unterriexingen lies on a by the Glems split terrace of the Enz, which rises to the south and was covered by a glacial Loess layer.

The village lies on the northern edge of the Strohgäu about four kilometers north of Markgröningen.

About 400 meters below the town the Glems opens in the Enz.

Around Unterriexingen are the settlements of Großsachsenheim, Untermberg, Markgröningen, Talhausen, Aichholzhof, Pulverdingen, Enzweihingen, Leinfelder Hof and Oberriexingen (from the north clockwise).