Heidenheim (German pronunciation: [ˈhaɪdn̩ˌhaɪm] ⓘ) is a Landkreis (district) in the east of Baden-Württemberg, Germany.

Neighboring districts are (from north clockwise) Ostalbkreis, Dillingen, Günzburg, Alb-Donau and Göppingen.

The district dates back to the Oberamt Heidenheim, which was created at the beginning of the 19th century.

The coat of arms show the colors of the Lords of Hellenstein in the left half.

The area was split between many ruling families, who built castles for protecting their ownership.