Mac OS may refer to one of the following operating systems developed by Apple Inc. (formerly Apple Computer) for their Macintosh platform:
- Classic Mac OS, originally released in January 1984.
- Mac OS X, officially debuted in March 1999, code named "Rhapsody".
- macOS, officially debuted in September 2016 as 10.12 "Sierra".
This is a disambiguation page for Mac OS
Please follow one of the links or search if the page you're looking for is not listed. If an internal link redirected you here, you may wish to change it to point directly to the intended page.