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In the title moleclue, C13H10N4O3, the methylidene–hydrazide [–C(=O)—N—N=C–] fragment is essentially planar, with a maximum deviation of 0.0228 (7) Å. The mean planes of the benzene and pyridine rings make dihedral angles of 25.44 (6) and 5.47 (7)°, respectively, with the mean plane of the methylidene–hydrazide fragment. In the crystal structure, intermolecular N—H...N hydrogen bonds link molecules into chains along the b axis. Additional stabilization is provided by weak intermolecular C—H...O hydrogen bonds. The O atoms of the nitro group are disordered over two sets of sites of equal occupancy.