The Cultana Subsuite is a high-level felsic magmatic intrusion exposed in the Cultana Inlier in the southeastern Gawler Craton, South Australia (Fig. 1) It is part of the Hiltaba Suite, an early Mesoproterozoic (c. 1595?1575 Ma) bimodal magmatic suite that is widespread across the Gawler Craton and coeval with the voluminous Gawler Range Volcanics (Flint et al. 1993; Creaser 1996). The Cultana Subsuite comprises a range of comagmatic granitic and porphyritic lithologies, including quartz?feldspar porphyry, alkali granite, feldspar-phyric granophyric monzogranite, alkali-feldspar microgranite and micro-syenogranite.This paper provides a formal definition of the Cultana Subsuite, outlining the igneous petrology of the intrusion and its geochemical characteristics.