The Master System is a video game console released by Sega in North America in September 1986 to compete with the Nintendo Entertainment System, which had been released in the same market in February 1986, following an earlier test launch in New York in October 1985. The Master System was a renamed and redesigned version of the Sega Mark III, which had been released in Japan on October 20, 1985. The Master System was later released in Europe in August 1987, in South Korea in April 1989 and in Brazil in September 1989 where distribution rights were given to Tectoy. A re-release of the console in the Japanese market under the new Master System brand and redesign also occurred on October 18, 1987. Sega released a further streamlined redesign of the console a year after the launch of the Sega Genesis in 1990.

There are 314 game titles for the Master System. 18 were released exclusively in Japan, 4 were released exclusively in North America, 158 were released exclusively in PAL regions and 22 were released exclusively in Brazil.