System weithredu (yn aml wedi ei dalfyru i OS o'r term Saesneg, Operating System) yw'r rhyngwyneb rhwng y caledwedd a'r defnyddiwr.
Mae'r system weithredu yn gyfrifol am reoli a chydlynu gweithgareddau a hefyd rhannu adnoddau'r cyfrifiadur.
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