This is a list of old Macintosh software that no longer run on current Macs. The software might require Mac OS 9 or other versions of Classic Mac OS. Most old programs can still be run using emulators, such as SheepShaver, vMac, or Basilisk II.
For a list of current programs, see List of Mac software. Third-party databases include VersionTracker, MacUpdate and iUseThis. Since a list like this might grow too big and become unmanageable, this list is confined to programs for which a Wikipedia article exists.