In the title compound, [CoBr(2)(C(14)H(12)N(2))]·CH(3)CN, the Co(II) atom is four-coordinated in a distorted tetra-hedral geometry by two N atoms from a chelating 2,9-dimethyl-1,10-phenanthroline ligand and two terminal Br atoms. In the crystal, π-π contacts between the pyridine and benzene rings [centroid-centroid distances = 3.828 (5), 3.782 (5), 3.880 (5) and 3.646 (5) Å] stabilize the structure.