The centrosymmetric dinuclear complex bis­(μ-3-carb­oxy-6-methyl­pyridine-2-carboxyl­ato)-κ³N,O²:O²;κ³O²:N,O²-bis­[(2,2′-bi­pyridine-κ²N,N′)(nitrato-κO)cadmium] methanol monosolvate, [Cd₂(C₈H₆NO₄)₂(NO₃)₂(C₁₀H₈N₂)₂]·CH₃OH, was isolated as colourless crystals from the reaction of Cd(NO₃)₂·4H₂O, 6-methyl­pyridine-2,3-di­carb­oxy­lic acid (mepydcH₂) and 2,2′-bi­pyridine in methanol. The asymmetric unit consists of a Cd^II cation bound to a μ–κ³N,O²:O²-mepydcH^- anion, an N,N′-bidentate 2,2′-bi­pyridine group and an O-mono­dentate nitrate anion, and is completed with a methanol solvent mol­ecule at half-occupancy. The Cd complex unit is linked to its centrosymmetric image through a bridging mepydcH^- carboxyl­ate O atom to complete the dinuclear complex mol­ecule. Despite a significant variation in the coordination angles, indicating a considerable departure from octa­hedral coordination geometry about the Cd^II atom, the Cd–O and Cd–N distances in this complex are surprisingly similar. The crystal structure consists of O–H⋯O hydrogen-bonded chains parallel to a, further bound by C–H⋯O contacts along b to form planar two-dimensional arrays parallel to (001). The juxtaposed planes form inter­stitial columnar voids that are filled by the methanol solvent mol­ecules. These in turn inter­act with the complex mol­ecules to further stabilize the structure. A search in the literature showed that complexes with the mepydcH^- ligand are rare and complexes reported previously with this ligand do not adopt the μ–κ³ coordination mode found in the title compound.