The STM8 is an 8-bit microcontroller family by STMicroelectronics. The STM8 microcontrollers use an extended variant of the ST7 microcontroller architecture. STM8 microcontrollers are particularly low cost for a full-featured 8-bit microcontroller.

STMicroelectronics N.V. is a multinational corporation and technology company of French-Italian origin. It is headquartered in Plan-les-Ouates, Switzerland and listed on the New York Stock Exchange, on the Euronext Paris in Paris and on the Borsa Italiana in Milan. 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.