STMicroelectronics N.V. commonly referred as ST or STMicro is a Dutch multinational corporation and technology company of French-Italian origin headquartered in Plan-les Ouates near Geneva, Switzerland, and listed on the French stock market. ST is the largest European semiconductor contract manufacturing and design company. The company resulted from the merger of two government-owned semiconductor companies in 1987.

Thomson Semiconducteurs of France and SGS Microelettronica of Italy.