Westerstetten (Swabian: Weschdrschdett) is a village in the district of Alb-Donau in Baden-Württemberg in Germany.

Westerstetten is situated in the Lone valley (Lonetal) in the Swabian Jura roughly 10 km (6 mi) north of Ulm.

The neighbouring villages are, to the east, Holzkirch and Breitingen; to the south, Beimerstetten; to the southwest, Dornstadt; and to the northwest, Lonsee.

As part of the Alb Limes, this road marked for some time the external border of the Roman Empire.

The Jewish graves in the cemetery hold the bodies of eight Nazi concentration camp victims that were hastily buried in the Gurgelhaus forest, shortly before the end of the war.

Westerstetten has numerous long-established and newly established craft and service businesses.