Abstract: Küçük Menderes River Delta Complex, which developed in a large graben (Küçük Menderes Graben)through Pleistocene-Holocene time, consists of four, superimposed delta sequences (Dl=4) Each sequence was separatedby fine-grained, marine sediments and / or an erosion surface characterizing a sea transgression.The recent Küçük Menderes river delta (Dl) with a large subaerial plain, the youngest member of the complex, hasprograded since Late Holocene. Core and seismic data, collected from the gulf of Kuşadası, display that sea-level changes were typical during the Pleistocene and Holocene time, and shoreline prograded up to Recent shelf-break (-130 mwater depth) three times at least, after abrupt transgression periods. The last waste sea transgression was in Late Holocene and sea water advanced towards the east, up to 11 km.The delta complex was disturbed by many synsedimentary and post-sedimentary fractures, which are mostly downfaults. The active and relatively bigger ones are observed in the northern part of the gulf. Submarine sector, particularlyprodelta areas of the recent delta (Dl) has been growing towards the same direction, however the formers, apparently,D3and D4 sequences, developed mostly in southern side of the Kuşadası gulf occupying the Küçük Menderes graben. Thisrecognised relation presents that active graben tectonism importantly affected the deltaic deposition, in addition to global sea-level changes.