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The title compound, [PdBr(C3H5)(C9H8N2)], was synthesized by the reaction of the allylpalladium(II) bromide dimer and 1-phenyl-1H-imidazole. The Pd atom is coordinated by one allyl group [in η3 mode, the central CH group of the allyl group is disordered over two sets of sites in a 0.668 (5):0.332 (5) ratio], one bromide anion and a 1-phenyl-1H-imidazole ligand. Intramolecular face-to-face π–π stacking interactions occur between adjacent phenyl or imidazole groups, with centroid–centroid distances in the range 3.877 (1)–3.6596 (6) Å, forming a supramolecular chain along [100].