Kaysersberg (French: [kajzœʁsbɛʁɡ]; German: Kaisersberg [ˈkaɪzɐsbɛʁk] ; Alsatian: Kaiserschbarig) is a historical town and former commune in Alsace in northeastern France. The name is German for Emperor's Mountain. The high fortress that dominates the town serves as a reminder of both its strategic importance and its warlike past.

Kaysersberg lies in the canton of Sainte-Marie-aux-Mines, which itself is a subdivision of the Colmar -Ribeauvillé arrondissement. It was a separate commune until 1 January 2016, when it was merged into the new commune of Kaysersberg Vignoble together with nearby Kientzheim and Sigolsheim , and remains its seat.

The town was first mentioned in 1227, when Frederick II, Holy Roman Emperor purchased the castle and gave orders to refortify it.