Obernai (Alsatian: Owernah; German: Oberehnheim) is commune in the Bas-Rhin department in Alsace in north-eastern France.

This appears to be a continuation of groups from the Linear Pottery culture who were located also on the eastern side of the Rhine.

The town was ransomed and ceded to France in 1679, and started to recover some of its prosperity, without totally recapturing its former glory.

During the German occupation in the Second World War, the Nazi authorities set up the Reichsschule für SS Helferinnen Oberenheim, a Waffen-SS women's training centre, which opened in May 1942 upon the order of Heinrich Himmler.

The industrial activity features the following companies: Hager, Kronenbourg, Triumph, Sobovia, Supra and Stoeffler.