Piiumetsa soo (ka: Rumbi soo, Rumbi raba, Kummassaare soo, Kummassaare raba) on soo Rapla ja Järva maakonnas.
Soo pindala on 9542 ha, millest Rapla maakonda jääb 771 ha ja Järva maakonda 8771 ha. Soo kaitseks moodustati 1981. aastal Piiumetsa sookaitseala.
Soo turbakihi paksus on kuni 5 m.
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