This paper reports the first discovery of a stegodont from Sishui, Shandong, represented by a partial maxilla preserving associated left and right M2–M3 series. The specimen is characterized by the following features: in ventral view, the upper jaw is relatively narrow with the left and right tooth rows converging anteriorly; the M3 crown possesses 8 ridges/lophs; the anterior ridges, upon wear, reveal a faint median sulcus and remnants of the central conule; and the enamel layer is well-folded. The ridge morphology and conelet arrangement pattern conform to the typical characteristics of the genus Stegodon. Based on the presence of 8 ridges on the M3, its large body size, and a notably higher ridge count compared to its direct ancestor, Stegodon zdanskyi (M3 typically with 6–7 ridges), while falling within the known range of variation of Stegodon chiai (M3 with 8–9 ridges), this specimen is referred to Stegodon chiai Chow & Zhai, 1962. Its geological age is likely Early Pleistocene or Late Pliocene. This specimen represents the first discovery of an upper jaw of Stegodon chiai and the first record of stegodont fossils in Shandong Province, providing important new evidence for the morphology, geographic distribution, and evolutionary relationships of this species in East and South Asia. It also provides important support for the reconstruction of paleogeography and paleoclimate.