After the 2016 Gyeongju Earthquake (MW 5.5) in SE Korea, the NNE‒SSW-striking Yangsan Fault (YF) seismicity has emerged as a significant scientific issue and hazard. Despite previous studies of the seismicity of the YF, the paleoseismic information of the fault remain uncertain. We carried out paleoseismic investigations to characterize surface rupturing and the paleoseismic history of the northern section of the southern YF. Deflected streams and displaced river terraces indicate a dextral sense of slip, and fault splays cutting unconsolidated sedimentary strata in trench walls show an east-side-up geometry. The dextral strike-slip faulting with a minor reverse component is characterized by several noticeable stratigraphic features, including fissure-filling deposits, sag ponds, and cut-and-fill streams along the fault splay. Based on fault‒sediment cross-cutting relationships and optically stimulated luminescence ages of unconsolidated sediments, we propose two possible rupture scenarios for the most recent earthquake event along the studied fault section during the Late Pleistocene: (1) a single rupture along the entire section (WS‒MH‒IBN‒IB) at ca. 30 ka and (2) individual partial ruptures along two segments of the section (WS‒MH and IBN‒IB) during 33‒30 and 29‒17 ka, respectively. It is also noted that the timings of earlier ruptures (penultimate earthquake events) of the two segments are 37‒35 and 70‒52 ka, respectively. Furthermore, the timing(s) of the most recent earthquake for our studied section is much older than that of the southern section of the northern YF.