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In the complex cation of the title compound, [Mg(C10H8N2)(H2O)4](C7H4BrO2)2, the MgII atom is coordinated by two N atoms from a 2,2′-bipyridine ligand and four water O atoms in a distorted MgN2O4 octahedral geometry. The cation is located on a special position on a twofold rotation axis which passes through the MgII atom and the centroid of the 2,2′-bipyridine ligand. The 2,2′-bipyridine ligands exhibit nearly perfect coplanarity (r.m.s. deviation = 0.0035 Å) . In the crystal, O—H...O and C—H...O, C—H...Br hydrogen bonds and π–π stacking interactions [mean interplanar distance of 3.475 (6) Å between adjacent 2,2′-bipyridine ligands] link the cations and anions into a three-dimensional supramolecular network. One Br atom is disordered over two sites with occupancy factors of 0.55 and 0.45.