In the title compound, C(2)H(10)N(2) (2+)·2C(6)H(4)NO(2) (-), the cation lies on an inversion centre. The asymmetric unit is composed of one nicotinate anion and one half ethyl-enediaminium cation. All the amino H atoms are involved in N-H⋯O and N-H⋯N hydrogen bonds. These hydrogen bonds link the ionic units into a three-dimensional network. In addition, π-π inter-actions between pyridine rings [centroid-centroid distance = 3.6037 (7) Å] further stabilize the crystal structure.