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The title structure, C6H4N2·C8H8O2, is built up from an assembly of isonicotinonitrile and 4-methylbenzoic acid molecules and may be regarded as a co-crystal. The two planar molecules [r.m.s. deviations of 0.002 (6) and 0.0028 (11) Å, respectively] are linked by O—H...N and C—H...O hydrogen bonds. They are nearly coplanar and only twisted from each other by a dihedral angle of 2.48 (6)°. In the crystal, the components are interconnected by slipped π–π stacking [centroid–centroid distance = 3.6797 (11), slippage = 1.304 Å] and intermolecular C—H...N interactions.