The two fused five- and six-membered rings building the mol-ecule of the title compound, C(13)H(10)BrN(3), are approximately planar, the largest deviation from the mean plane being 0.004 (2) Å. The dihedral angle between the imidazo[4,5-b]pyridine mean plane and that of the phenyl ring is 41.84 (11)°. The structure is held together by slipped π-π stacking between symmetry-related mol-ecules, with an inter-planar distance of 3.583 (1) Å and a centroid-centroid vector of 3.670 (2) Å.