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SAX J1818.6−1703 has been characterized as a supergiant fast X‐ray transient system on the basis of several  INTEGRAL / IBIS  detections since the original BeppoSAX Wide Field Camera detection. Using IBIS/ISGRI,  Swift /BAT and archival observations, we show that, in fact, SAX J1818.6−1703 exhibits emission on a period of 30 ± 0.1 d, with a high degree of recurrence. SAX J1818.6−1703 is therefore the second supergiant fast X‐ray transient shown to exhibit periodic outbursts, but with a considerably shorter period than the other known system, IGR J11215−5952.

Discovery of a 30‐d period in the supergiant fast X‐ray transient SAX J1818.6−1703