The Sega 32X is an add-on for the Sega Mega Drive video game console by Sega.

In Japan, it was distributed under the name Sega Super 32X. In North America, its name was the Sega Genesis 32X. In Europe, Australia, and other countries that use PAL, it was called the Sega Mega Drive 32X. Most gamers, for simplicity's sake, refer to it as just the "32X".

With the release of the Super Famicom in Japan and the Super NES in North America, Sega needed to leapfrog Nintendo in the technological department. The Sega Mega-CD, known as Sega CD in North America, had not worked as well, in a business sense, as Sega had wanted it to. Sega had various developments underway, and focused most of its energy on the then new Sega Saturn. Some used System 16 technology, as the Sega Mega Drive, as well as other arcade games, did.

The 32X was released in mid-November 1994 in North America for $150.