The RISC System/6000 (RS/6000) is a family of RISC-based (Reduced Instruction Set Computer-based) Unix servers, workstations and supercomputers made by IBM in the 1990s.

Some later models conformed to the PReP and CHRP standard platforms, which were co-developed with Apple and Motorola, with Open Firmware (OpenFW/OFW).

The RS/6000 family also included the POWERserver servers, POWERstation workstations and Scalable POWERparallel supercomputer platform.

Many RS/6000 and subsequent pSeries machines came with a service processor, which booted itself when power was applied and continuously ran its own firmware, independent of the operating system.

These units were configured by IBM as experimental "NSS" ("Network Switching Subsystem") routers, and used on the NSFnet T3 backbone in the early/mid-90s.

Produced since 1994 until the time were the RS/6000 line was rebranded to System P. The Model N40 was a PowerPC-based laptop developed and manufactured by Tadpole Technology in conjunction with IBM.