<p>The late Paleozoic to early Mesozoic sandstones of the Fincha’a Valley in the Blue Nile Basin, Northwestern Ethiopia, were investigated to assess their Paleocurrents and tectonic provenance. The study used systematic measurement of sedimentary structures for paleocurrent analysis and petrographic examination of twenty-three sandstone samples to constrain paleotectonic provenance. The paleocurrent analysis results show a systematic change in sediment transport direction from predominantly west-derived paleoflow during the late Paleozoic (pre-Adigrat sandstone) to northeast- and southeast-derived paleoflow during the early Mesozoic (Adigrat sandstone), indicating a major reorganization of the Blue Nile Basin. The quantitative investigation of detrital framework grains from Adigrat sandstone shows that the sandstones primarily consist of quartz (33–100%), feldspar (0–50%), and lithic fragments (0–54%). Common cements include quartz, iron oxides (hematite), clay, and calcite. The modal composition data indicate that the pre-Adigrat sandstone is classified as quartz arenite, whereas the Adigrat sandstones are lithic arenite and sublithic arenite. The integrated petrographic and modal evidence suggests that the pre-Adigrat sandstones were derived mainly from compositionally mature, deeply weathered granitic and medium to high-grade metamorphic source rocks subjected to prolonged transport. In contrast, the Adigrat sandstone reflects a more heterogeneous provenance, including contributions from metamorphic, plutonic, and subordinate mafic igneous sources, but mainly derived from felsic source rocks. Combined paleocurrent trends and provenance triangular plots indicate that the Fincha’a Valley sandstones were sourced from the western Ethiopian basement complex, recycled sedimentary rocks, the metacraton, and nearby plutonic intrusions.</p>