L. Kellenberger & Co. AG is an international Swiss manufacturer of high-precision grinding machines based in St. Gallen and one of the world's leading suppliers of precision cylindrical grinding machines. The company belongs to Hardinge Inc., a leading international provider of advanced metal-cutting solutions.

Products available under the Kellenberger brand include:

Hauser: Jig Grinding

Tschudin: Cylindrical Grinding

Jones and shipman: Small component Cylindrical Grinding.

Voumard: Internal Grinding.