Seltz (French pronunciation: [sɛlts]; German: Selz) is a commune in the Bas-Rhin department of the Grand Est region in north-eastern France.

[3] It is located on the Sauer River near its confluence with the Rhine, opposite the German town of Rastatt.

The former Celtic settlement of Saliso near a crossing of the Rhine river was mentioned as the Roman castrum Saletio in the Notitia Dignitatum about 425.

Later a part of the German stem duchy of Swabia, Emperor Otto I granted the area to his wife Adelaide of Burgundy in 968.

In 1357 Emperor Charles IV of Luxembourg raised Selz to an Imperial city, after which the town joined the Alsatian Décapole league.