Sontheim (full name: Sontheim an der Brenz) is a municipality in the district of Heidenheim in Baden-Württemberg in southern Germany.

It is located northeast of Ulm, at the southern end of the Swabian Jura.

Sontheim shares borders with the following towns and villages: Hermaringen (Heidenheim District) in the north, Bächingen an der Brenz (Dillingen District, Bavaria) in the east and the south, as well as Niederstotzingen (Heidenheim District) in the west.

Brenz and Bergenweiler became part of Sontheim during Baden-Württemberg's last district reform in the 1970s.

This Heidenheim district location article is a stub.