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In the title 1:1 co-crystal, C 10 H 8 N 2 ·C 15 H 12 O 5 , strong inter­molecular O—H⋯N hydrogen bonds link alternating mol­ecules of 4,4′-(hy­droxy­methyl­ene)dibenzoic acid and 4,4′-bipyridyl into zigzag chains in [501]. The crystal packing also exhibits π–π inter­actions between the 4,4′-bipyridyl rings of neighbouring chains [centroid–centroid distance = 3.608 (3) Å] and weak C—H⋯O hydrogen bonds.

4,4′-Bipyridyl–4,4′-(hydroxymethylene)dibenzoic acid (1/1)