KLA Tencor (formerly ICOS Vision Systems) is a leading world-wide developer and supplier of inspection equipment, primarily for use in the back-end semiconductor and the electronics assembly markets.

KLA Tencor designs and manufactures inspection equipment for semiconductor packaging and interconnect applications. It is a world-leading supplier of equipment for the visual inspection of IC's, before they are used in various applications such as PC's, portable phones or cars. KLA Tencor's systems perform two-and three-dimensional (2D and 3D) inspection of IC's, wafers, solar cells, substrates, sockets, etc. ICOS offers stand-alone inspection systems, as well as inspection modules for integration.

KLA Tencor is headquartered in Leuven, Belgium and has R&D centers in Belgium, Germany and Hong Kong, sales and support offices in Japan, the USA, Singapore, Hong Kong, Korea and Taiwan and production facilities in Belgium, Hong Kong and China.