Leica Microsystems GmbH is a German microscope manufacturing company.

The merger of those two umbrella companies created an alliance of the following 8 individual manufacturers of scientific instruments.

American Optical Scientific Products, Carl Reichert Optische Werke AG, R.Jung, Bausch and Lomb Optical Scientific Products Division, Cambridge Instruments, E.Leitz Wetzlar, Kern & Co., and Wild Heerbrugg AG, bringing much-needed modernization and a broader degree of expertise to the newly created entity called Leica Holding B.V. group.

In 1997 the name was changed to Leica Microsystems and is a wholly-owned entity of Danaher Corporation since July 2005.

The company manufactures products for applications requiring microscopic imaging, measurement and analysis.