RISC OS yw enw system weithredu ar gyfer cyfrifiaduron a grewyd yn wreiddiol gan gwmni Prydeinig, Acorn Computers. Daeth Acorn Computers i ben yn 1998, ond ers hynny mae'r system a'r caledwedd wedi cael ei gynhyrchu gan sawl grŵp o gwmnïau:
- Castle Technology (RiscPC (1999 - 2003), A7000+ (1999 - 2006), Iyonix (2002 - Presennol), RISC OS 5 (2002 - Presennol)).
- RISCOS Ltd. (RISC OS 4 (1999 - 2005), RISC OS Select (2001 - Presennol), RISC OS Adjust (2004 - Presennol), RISC OS 6 (2006 - Presennol)).
- Advantage Six (A6 (2003 - Presennol), A75 (2003 - Presennol), A5 (2004 - Presennol), A9Home (2005 - Presennol), A9WAI (2007 - Presennol).
- RISC OS Open (RISC OS 5 (2006 - Presennol))
Ers 2018 mae RISC OS 5 yn "open source software". Mae hi'n gallu defnyddio cyfrifiaduron bach Raspberry Pi.
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