Credence Systems Corporation was a manufacturer of test equipment for the global semiconductor industry, with a major focus on solving specific challenges facing the fast-growing consumer-driven semiconductor markets. Founded in 1978 by David Mees as Semiconductor Test Solutions, the company changed its name to Credence after acquiring Axiom and ASIX in 1990. The company's initial public offering was completed on October 28, 1993. It was publicly traded on the Nasdaq stock market under the symbol CMOS before the merger with LTX in 2008. It was headquartered in Milpitas, California, and was established in twenty countries.

Customers included integrated device manufacturers (IDMs), wafer foundries, outsource assembly and test (OSAT) suppliers and fabless chip companies.