In the title compound, C(6)H(7)N(3)O(2), the dihedral angle between the nitro group and the pyridine ring is 15.5 (3)° and an intra-molecular N-H⋯O hydrogen bond occurs. In the crystal, inversion dimers linked by two N-H⋯N hydrogen bonds occur, resulting in R(2) (2)(8) rings. The packing is stabilized by aromatic π-π stacking [centroid-centroid distance = 3.5666 (15) Å] and a short N-O⋯π contact is seen.