System 8 may refer to:
Computing Copland, an unreleased operating system Mac OS 8, a late 1990s version of the Macintosh operating system Digital Equipment Corporation PDP-8 operating systems: OS/8, released in 1971 TSS/8, released in 1968 MS/8, released in 1966 PDP-8 4K Disk Monitor System, released in 1965 Exec 8, the Unisys operating system WPS-8 (Word Processing System-8) - Digital Equipment Corporation word processor
Other uses STS-8 (Space Transportation System-8), the Space Shuttle mission Base-8 number system Roland System-8, the Roland Corporation synthesizer
See also OS8 (disambiguation)